1. Brøndsted, H. V., 1969. Planarian regeneration. Pergamon Press, Oxford.
2. Duma, A., 1981. Activity in cAMP phosphodiesterase in the early regeneration stage of planarian Dugesia lugubris (O. Schmidt). Ultracytochemical studies. Acta Medica Polona (in press).
3. Duma, A. & Moraczewski, J., 1980. Ultracytochemistry of cyclic 3’5’ nucleotide phosphodiesterase activity in the planarian Dugesia lugubris (O. Schmidt). Histrochemistry 66: 211–220.
4. Franquinet, R., Stengel, O. & Hanoune, J., 1976. The adenylate cyclase system in a freshwater planarian (Polycelis tenuis lijima). Comp. Biochem. Physio. 53B: 329–333.
5. Franquinet, R., Le Moigne, A. & Hanoune, J., 1978. The adenylate cyclase system of Planarian Polycelis tenuis. Activation by serotonin and guanine nucleotides. Biochim. Biophys. Acta 539: 88–97.