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Walker DJ* and DD Wittrock. (1999). Histochemistry and ultrastructure of the metacercarial cyst of Cryptogonimus chyli (Trematoda: Cryptogonimidae). Journal of the Helminthological Society of Washington 66: 82-86.
Walker DJ* and DD Wittrock. (1992). Histochemistry and ultrastructure of the metacercarial cyst of Bolbogonotylus corkumi (Trematoda: Cryptogonimidae). Journal of Parasitology 78: 725-730.
Wittrock DD, CS Bruce and A.D. Johnson. (1991). Histochemistry and ultrastructure of the metacercarial cysts of blackspot trematodes Uvulifer ambloplitis and Neascus pyriformis. Journal of Parasitology 77: 454-460.

Contact information:
Phillips Hall 333
Department of Biology
University of Wisconsin-Eau Claire
Eau Claire, WI 54702-4004
Ph: 715-836-3614
Fax: 715-836-5089
email: wittrod@uwec.edu