000 00477nam a2200181Ia 4500
008 131223s9999 xx 000 0 und d
040 _aISI KOLKATA
041 _aEnglish
082 _a510
_bAm512
100 _aFigueiredo Leila
245 _aCalculus of principally twisted vertex operators
260 _aN Y
_bAMS
_c1987
300 _aiv,58p
440 _aAmerican Mathematical Society: Memoirs; 371
650 _aMathematics
650 _aVertex operators
942 _cBK
999 _c6693
_d6693