Citation:Costa, H.H. (1980) The Effects of Some Heavy Metal Pollutants on the Heart Beat of Gammarus Pulex (L.), Crustaceana. Supplement No. 6, Studies on Gammaridea II (Proceedings of the 4th International Colloquium on Gammarus and Niphargus, Blacksburg, Virginia, U.S.A., 10-16 September 1978) (1980), pp. 170-181.