Bosonic construction of conformal field theories with extended supersymmetry

A large class of unitary N = 2 superconformal field theories are constructed in the bosonic representation. In particular, they include an infinite number of models with the Virasoro central charge (c) equaling 9, which are generalizations of the ones recently obtained by a closet space method. Similar results are also obtained fro c = 6, for which the algebra extends to that with N = 4 supersymmetry