%0 Journal Article %A A. Taormina %T Towards a classification of modular invariant partition functions for theories based on $N=4$ superconformal algebras %J Teoretičeskaâ i matematičeskaâ fizika %D 1993 %P 385-394 %V 95 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1993_95_2_a19/ %G ru %F TMF_1993_95_2_a19