1. Estimation of genic similarity within and between Arion hortensis s.l. and A. intermedins by means of isoelectric focused esterase patterns in hepatopancreas homogenates (Mollusca, Pulmonata: Arionidae;Backeljau;Zeitschrift für zoologische Systematik und Evolutionsforschung,1985
2. Electrophoretic distinction between Arion hortensis, A. distinctus and A. owenii (Mollusca: Pulmonata);Backeljau;Zoologischer Anzeiger,1987
3. Electrophoresis of albumen gland proteins as a tool to elucidate taxonomic problems in the genus Arion (Gastropoda, Pulmonata);Backeljau;Journal of Medical and Applied Malacology,1989b
4. On the infrageneric systematics of the genus Arion Férussac, 1819 (Mollusca, Pulmonata);Backeljau;Bulletin de l̂Institut Royal des Sciences Naturelles de Belgique, Biologie,1990