Zhou, Shanyou, The Closedness of Generalized Vertex Operators in Central Binomial Coefficients, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 8(3), 1992, pp. 255-265
This paper deals with the closedness of generalized vertex operators defined by the central binomial coefficient under Lie bracket. The formula of Lie product of generalized vertex operators has also been obtained.