Income sustainability through bee keeping in rubebr plantations under self-help groups: A comparative analysis of three regions in Kerala - Claramma P.V.; Gopakumar R.; Kurian Moncy P; Nair Ramesh B. (In: Towards Inclusive Rubber Development (Ed. C. Kuruvilla Jacob). The Rubber Board, Kottayam, India, pp. 245-251., 2009)