biblatex.cfg

\ExecuteBibliographyOptions{safeinputenc=true,backref=true,giveninits,useprefix=true,maxnames=5,doi=false,eprint=true,isbn=false,url=false}

\renewcommand{\bibfont}{\normalfont\footnotesize}

\newbibmacro{string+doiurl}[1]{%
  \iffieldundef{doi}{%
    \iffieldundef{url}{%
         #1%
      }{%
      \href{\thefield{url}}{#1}%
    }%
  }{%
    \href{https://doi.org/\thefield{doi}}{#1}%
  }%
}
\DeclareFieldFormat[article,misc,thesis,incollection]{title}{\usebibmacro{string+doiurl}{\mkbibquote{#1}}}

%% smart \MR
%% code suggested by Vilmos Prokaj <prokaj@cs.elte.hu>
%% solves the problem when MR is in a format
%%  \MR{MR1037262 (91i:60148)}

%% \woMR ("without MR"): this macro removes the MR prefix if it
%% is present and does not change the argument otherwise
\def\woMR#1{\w@MR#1MR#1MR\relax}%
\def\w@MR#1MR#2MR#3\relax{#2}

%% this creates a mathscinet URL using first part of MR... (...)
\def\MR@URL#1 #2\relax{https://www.ams.org/mathscinet-getitem?mr=#1}

\AtBeginDocument{
\@ifpackageloaded{hyperref}
{
\def\MRnumber#1{\href{\MR@URL#1 \relax}{\nolinkurl{\woMR#1}}}% make a link to mathscinet
}% else
{
\def\MRnumber#1{\texttt{\woMR#1}}% just typeset the MR number without prefix
}
\DeclareFieldFormat{mrnumber}{\mkbibacro{MR}\addcolon\space\MRnumber{#1}}
\newbibmacro*{doi+eprint+url}{%
  \iftoggle{bbx:doi}
    {\printfield{doi}}
    {}%
  \newunit\newblock
  \iftoggle{bbx:eprint}
    {\usebibmacro{eprint}}
    {}%
  \newunit\newblock
  \iftoggle{bbx:url}
    {\usebibmacro{url+urldate}}
    {}%
  \newunit\newblock
  \printfield{mrnumber}}
}