%0 Journal Article %T A bilateral series involving basic hypergeometric functions %A Hjalmar Rosengren %J Mathematics %D 2003 %I arXiv %X We prove a summation formula for a bilateral series whose terms are products of two basic hypergeometric functions. In special cases, series of this type arise as matrix elements of quantum group representations. %U http://arxiv.org/abs/math/0302114v1