Pal, P.K. and Arefin, M.B. 2007. Occurrence of a White Variety of <I>Hygrophila schulli</I> in West Bengal with a Note on its Reproductive Biology. Indian Forester. 133, 8 (Aug. 2007), 1136–1138. DOI:https://doi.org/10.36808/if/2007/v133i8/1187.