%0 Journal Article %A Maňas, Miroslav %T Special issue on econometrics and operational research %J Kybernetika %D 1997 %P 581-582 %V 33 %N 6 %U http://geodesic.mathdoc.fr/item/KYB_1997_33_6_a0/ %G en %F KYB_1997_33_6_a0