Fatahi, S., and S. M. Hoseini. “Effect of Dietary Tryptophan and Betaine on Tolerance of Caspian Roach (Rutilus Rutilus Caspicus) to Copper Toxicity”. International Journal of Aquatic Biology, vol. 1, no. 2, May 2013, pp. 76-81, doi:10.22034/ijab.v1i2.29.