EKWU, A.; SIKOKI, F. Phytoplankton diversity in the Cross River Estuary of Nigeria. Journal of Applied Sciences and Environmental Management, [S. l.], v. 10, n. 1, p. 89–95, 2006. DOI: 10.4314/jasem.v10i1.17296. Disponível em: https://www.ajol.info/index.php/jasem/article/view/17296. Acesso em: 18 oct. 2026.