\def\ps@headings{\let\@mkboth\markboth
\def\@oddfoot{}
\def\@evenfoot{}
 \def\@evenhead{%
              {\oldstylenums{\large\thepage}\hfil\hskip2mm \hrulefill\hskip2mm
\textsc{In\v{s}titut za matematiko, fiziko in mehaniko}}}
 \def\@oddhead{%
              {\textsc{Letno poro\v{c}ilo} \oldstylenums{\large 2019}\hskip2mm \hrulefill\hskip2mm \hfil \oldstylenums{\large\thepage}}}}