Stefanidou, M.E. Hatzi, V.I. Terzoudi, G.I. Loutsidou, A.C. Maravelias, C.P., Effect of cocaine and crack on the ploidy status of Tetrahymena pyriformis: A study using DNA image analysis, Cytotechnology, (63), 35-40, 2011, 0920-9069, 1573-0778