Kax, A. Majeed, et al. “<I>Wolffia papulifera< I> Thomps. And <I>W. Columbiana< I> Karsten-Two New Plant Records for India”. Indian Forester, vol. 104, no. 4, Apr. 1978, pp. 282-5, doi:10.36808/if/1978/v104i4/11764.