ヴィラソロ代数
Sci. Ecole Norm. Sup. 26, 93-161, http://www.numdam.org/numdam-bin/fitem?id=ASENS_1909_3_26__93_0
Feigin, B.L.; Fuks, D.B. (1984), Verma models over the Virasoro algebra, L.D. Faddeev (ed.) A.A. Mal'tsev (ed.) , Topology. Proc. Internat. Topol. Conf. Leningrad 1982 , Lect. notes in math. , 1060 ,, Springer
Friedan, D.; Qiu, Z.; Shenker, S. (1984), Conformal invariance, unitarity and critical exponents in two dimensions, Phys. Rev. Lett. 52, http://prola.aps.org/abstract/PRL/v52/i18/p1575_1
Gel'fand, I.M.; Fuks, D.B. (1968), The cohomology of the Lie algebra of vector fields in a circle, Funct. Anal. Appl.