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2. The British Freshwater Rhizopoda and Heliozoa. Vol. II. Rhizopoda, part. 2. London;Cash,1909
3. Difflugia oblongaEhrenberg et ses variétes;Chardez;Bull. Rech, agron. Gembloux,1967
4. Difflugia sphincta Jung Rhizopode testacé nouveau pour la microfaune de Belgique;Chardez;Bull. Rech, agron. Gembloux,1967
5. Nota sistematica sobre la validez de dos espeies de tecambianos: Difflugia oblongaEhrenberg y D. pyriformisPerty;Chardez;Physis,1973