This paper stands for a logic continuation of the previous work [A. Ronveaux, Factorization of the Henn's differential operator, Appl. Math. Comput. 141 (2003) 177-184]. We propose a factorization of the confluent, double confluent and biconfluent Heun's differential equations and investigate their solutions. (c) 2006 Elsevier Inc. All rights reserved.
Hounkonnou, M. N., Ronveaux, A., & Sodoga, K. (2007). Factorization of some confluent Heun’s differential equations. Applied Mathematics and Computation, 189(1), 816-820. https://doi.org/10.1016/j.amc.2006.11.170 (Original work published 2007)