1960. Mollusques. Tome 1 Mollusques terrestres and dulcicoles. Bruxelles, Inst. R. Sci. natur. Belgique. In 8vo, cloth with orig. front cover and spine pasted on, pp. 402 with 4 color pls., 15 b/w pl. and 163 figs.
1976. l.) decrites par F. Marrat (1877-8) et par H. von Maltzan (1884) (Mollusca Prosobranchia). In 8vo, offp., pp. 29 with 3 pls., 5 figs. Offprint from Bulletin of the Royal Belgian Institute of Natural Sciences, 51(2)
2022. Issel, 1869) with notes on some species of the genus Retusa (T. Brown, 1827) (Gastropoda: Cephalaspidea). In 4to, offp., pp. 7 with 3 color figs. Offprint from Boll. Mal., 58(2)