TY - JOUR AU - A. M. Semikhatov AU - B. L. Feigin TI - Free-field resolutions of unitary representations of the $N=2$ Virasoro algebra: II.~The butterfly resolution JO - Teoretičeskaâ i matematičeskaâ fizika PY - 1999 SP - 244 EP - 257 VL - 121 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_1999_121_2_a1/ LA - ru ID - TMF_1999_121_2_a1 ER -