Ultrastructural studies on the trypanosomatid phytomonas serpens in the salivary glands of a phytophagous hemipteran - Haapalainen, Edna; Milder, Regina Vugman; Jankevicius, José Victor; Jankevicius, S. I.; Camargo, Erney Felicio Plesmann de (Colóquio da Sociedade Brasileira de Microscopia Eletrônica, 1989)