1. Populations responses of the snail Bulinus (Physopsis) abyssinicus to differing inicial social and crowding conditions;AHMED M.D.;Malacol. Rev.,1986
2. Review literature on abiotic factors influencing the distribution and life cycles of bilharziasis intermediate host snails;APPLETON C.C.;Malacol. Rev.,1978
3. Studies on the snail vectors of bilharziasis mansoni in the North-Eastern Brazil;BARBOSA F.S.;Bull Wld Hlth Org.,1958
4. Possible competitive displacement and evidence of hybridization between two Brazilian species of planorbid snails;BARBOSA F.S.;Malacologia,1973
5. New field observations on the competitive displacement between two species of planorbid snails inhabiting North-Eastern Brazil;BARBOSA F.S.;Mem. Inst. Oswaldo Cruz,1981