A representation of some algebra in terms of a Heisenberg algebra. Also a representation of some function defined axiomatically, algebraically or combinatorially in terms of matrix elements or traces of some operator in a Fock representation of a Heisenberg algebra
-  V. S. Dotsenko and V. A. Fateev, Conformal Algebra and Multipoint Correlation Functions in Two-Dimensional Statistical Models, Nucl. Phys. B240 (1984) 312
-  V. G. Drinfeld, A New realization of Yangians and quantized affine algebras, Sov. Math. Dokl. 36 (1988) 212.