@Article{xxx-01,
  author-1 =     "Nikola{\u\i} Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u{\i}} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u{{\i}}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u{{}\i}} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u{{}{}\i}} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u{{}{}{}\i}} Nikolaevich Bogoljubov",
}

@Article{xxx-02,
  author-1 =     "Nikola{\u \i} Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {\i}} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{\i}}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}\i}} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}\i}} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}\i}} Nikolaevich Bogoljubov",
}

@Article{xxx-03,
  author-1 =     "Nikola{\u \i } Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {\i }} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{\i }}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}\i }} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}\i }} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}\i }} Nikolaevich Bogoljubov",
}

@Article{xxx-04,
  author-1 =     "Nikola{\u \i } Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {\i }} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{\i }}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}\i }} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}\i }} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}\i }} Nikolaevich Bogoljubov",
}

@Article{xxx-05,
  author-1 =     "Nikola{\u{\i}} Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u{{\i}}} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u{{{\i}}}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u{{}{\i}}} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u{{}{}{\i}}} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u{{}{}{}{\i}}} Nikolaevich Bogoljubov",
}

@Article{xxx-06,
  author-1 =     "Nikola{\u {\i}} Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {{\i}}} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{{\i}}}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}{\i}}} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}{\i}}} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}{\i}}} Nikolaevich Bogoljubov",
}

@Article{xxx-07,
  author-1 =     "Nikola{\u {\i} } Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {{\i} }} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{{\i} }}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}{\i} }} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}{\i} }} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}{\i} }} Nikolaevich Bogoljubov",
}

@Article{xxx-08,
  author-1 =     "Nikola{\u {\i} } Nikolaevich Bogoljubov",
  author-2 =     "Nikola{\u {{\i} }} Nikolaevich Bogoljubov",
  author-3 =     "Nikola{\u {{{\i} }}} Nikolaevich Bogoljubov",
  author-4 =     "Nikola{\u {{}{\i} }} Nikolaevich Bogoljubov",
  author-5 =     "Nikola{\u {{}{}{\i} }} Nikolaevich Bogoljubov",
  author-6 =     "Nikola{\u {{}{}{}{\i} }} Nikolaevich Bogoljubov",
}

@Article{xxx-09,
  title =        "Harmonic Radius and Concentration of Energy;
                 Hyperbolic Radius and {Liouville}'s Equations {$ \Delta
                 U = e^U $} and {$ \Delta U = U^{\frac {n + 2}{n - 2}}
                 $}",
}

@Article{xxx-10,
  booktitle =    "On $ \frac {n + 2} {n - 2} $ and {offloading}",
  title =        "On $ \frac {n + 2}{n - 2} $ and {offloading}",
}

@Article{xxx-11,
  booktitle =    "On $ \frac {n + 2} {n - 2} $ and {offloading}",
  title =        "On $ \frac {n + 2}{n - 2} $ and {offloading}",
}

@Article{xxx-12,
  booktitle =    "On $ \frac {n + 2} {n - 2} $ and {offloading}",
  title =        "On $ \frac {n + 2}{n - 2} $ and {offloading}",
}

@Article{xxx-13,
  title =        "Math $_2 {F}_2 (\ldots)$",
}

@Article{xxx-14,
  title =        "The Asymptotic Expansion of a Hypergeometric Function
                 $_2 {F}_2 (1, \alpha; \rho_1, \rho_2; z)$",
}

@Article{xxx-15,
  title =        "Multiple-pathways of carbon dioxide binding by a
                 {Lewis} acid {[B(C$_6$F$_5$)$_3$]} and a {Lewis} base
                 {[P(tBu)$_3$]}: the energy landscape perspective",
}

@Article{xxx-16,
  title =        "$_2 {F}$",
}

@Article{xxx-17,
  title =        "{$_2 F$}",
}

@Article{xxx-18,
  title =        "{${}_2 F$}",
}

@Article{xxx-19,
  title =        "$_2 {F}$",
}

@Article{xxx-20,
  title =        "{Lewis} acid {[B(C$_6$F$_5$)$_3$]} and a {Lewis} base
                 {[P(tBu)$_3$]}",
}

@Article{xxx-21,
  title =        "($x$)",
  title =        "( $x$ )",
  title =        "[$x$]",
  title =        "[ $x$ ]",
  title =        "{$x$}",
  title =        "{ $x$ }",
  title =        "<$x$ >",
  title =        "< $x$ >",
  title =        "$x$ word",
  title =        "$x$ value",
  title =        "$x$-valued",
}

@Article{xxx-22,
  note =         "Cited in {{\AA}ke Bj{\"o}rck's} bibliography.",
  note =         "Cited in {\AA}ke Bj{\"o}rck's bibliography.",
  note =         "Cited in {\AA}ke Bj{\"o}rck's bibliography.",
}

@Article{xxx-23,
  title =        "Mixed mortar element method for {$ P_1^{NC-}P_0 $}
                 element and its multigrid for {Stokes} problem",
}

@Article{xxx-24,
  title =        "Universidad pontificia de Santo Tom{\'a}s",
  title =        "{Universidad pontificia de Santo Tom{\'a}s}",
}

@Article{xxx-25,
  title =        "Le{\c{c}}ons",
  title =        "Le{\c{c}}ons",
}

@Article{xxx-26,
  title =        "On a Conjecture by {Erd{\H{o}}s--Straus}",
  title =        "On a Conjecture by {Erd{\H{o}}s--Straus}",
  title =        "On a Conjecture by {Erd{\H{o}}s--Straus}",
}

@Article{xxx-27,
  title =        "Review of {{\em Programmeringsspr{\aa}k\/}}",
  title =        "Review of {{\em Programmeringsspr{\aa}k\/}}",
}

@Article{xxx-28,
  title =        "Beltr{\'a}n Mar{\'\i}",
  title =        "Beltr{\'a}n Mar{\'\i}",
}

@Article{xxx-29,
  title =        "{Georges Lema{\^\i}tre's} {\em annus mirabilis}",
  title =        "{Georges Lema{\^\i}tre's} {\em annus mirabilis}",
}

@Article{xxx-30,
  title =        "Lema{\^\i}tre",
  title =        "Doro{\u\j}",
  title =        "Doro{\d{k}}",
  title =        "Bo{\^\alpha}",
  title =        "Bo{\^\beta}",
}

@Article{xxx-31,
  editor =       "Behram Kur{\c{s}}uno{\u{g}}lu and Eugene Paul Wigner",
  editor =       "Behram Kur{\c{s}}uno{\u{g}}lu and Eugene Paul Wigner",
}

@Article{xxx-32,
  title =        "{ECMA-236}: 3,81\,mm Wide Magnetic Tape Cartridge",
  title =        "{ECMA-236}: 3,81,mm Wide Magnetic Tape Cartridge",
  title =        "{ECMA-236}: 3,81, mm Wide Magnetic Tape Cartridge",
}

@Article{xxx-33,
  title =        "The applicative part of {APL\@}. Sequences",
  title =        "The applicative part of {APL\@} . Sequences",
}

@Article{xxx-34,
  booktitle =    "Semi\-nu\-mer\-i\-cal Algorithms",
  title =        "The {Experium\TM} {Knowledge Resource System}",
  remark =       "From \cite {Logan:1978:FDP}: ``Benford's paper was
                 \ldots{}.''",
}

@Article{xxx-35,
  booktitle =    "Below 3,000,000,000",
  title =        "Below $ 3, 000, 000, 000 $",
  note =         "Below $ 3 \, 000 \, 000 \, 000 $",
}

@Article{xxx-36,
  title =        "The $ \alpha { and } \beta $ study",
}

@Article{xxx-37,
  title =        "For $ |x| >= 17 $",
}

@Article{xxx-38,
  title =        "For $ |x| <= 17 $",
}

@Article{xxx-39,
  title =        "For $ |x| := 17 $",
}

@Article{xxx-40,
  title =        "Applications (K{\=o}riyama, 1988)",
  title =        "Applications (K{\=o}riyama, 1988)",
  title =        "Applications (K{\=o}riyama, 1988)",
}

@Article{xxx-41,
  title =        "For $ x > l o g(y) $",
  title =        "For $ x > \log (y) $",
}
