A new class of theta-function identities originating in Ramanujan’s notebooks
In the unorganized pages of his second notebook, Ramanujan offers two new theta-function identities that have a form different from other identities found in the literature. Using the theory of modular forms, we prove a general theorem containing Ramanujan′s two identities as special cases. © 1994 Academic Press Inc.
Berndt, Bruce C., and Liang-Cheng Zhang. "A New Class of Theta-Function Identities Originating in Ramanujan′ s Notebooks." Journal of Number Theory 48, no. 2 (1994): 224-242.
Journal of Number Theory