Palmer 1981. Three cestodes from the black swan: Hymenolepis chenopsis sp. n. and redescriptions of Parabisaccanthes bisacculina (Szpotanska, 1931) Maksimova, 1963, and Monosaccanthes kazachstanica (Maksimova, 1963) Czaplinski, 1967. Acta Parasitologica Polonica, 28(14) 1981: 125-139