1. An improvement in the protargol technique of Ng and Nelsen;Aufderheide;Trans. Am. Microsc. Soc.,1982
2. The staining of paraffin sections of nervous tissues with activated protargol. The role of fixatives;Bodian;Anat. Rec,1937
3. Impregnation, par diffusion argentique, de l’infraciliature des ciliés marins et d’eau douce, apres fixation cytologique et sans dessiccation;Chatton;C. R. Seanc. Soc. Biol.,1930
4. Aspidisca orthopogon n. sp. Revision de certains mecanismes de la morphogenese a l’aide d’une modification de la technique au protargol;Deroux;Cah. Biol. Mar.,1965
5. Neubeschreibung der Morphogenese von Paraholosticha muscicola Kahl, 1932 (Ciliophora, Hypotrichida);Dieckmann;Arch. Potistenkd.,1989