Relative concentrations of four heavy metals in the parasites Protospirura muricola (Nematoda) and Inermicapsifer arvicanthidis (Cestoda) in their definitive host silvery mole-rat (Heliophobius argenteocinereus: Rodentia) / V. Baruš, F. Tenora, R. Šumbera. Helminthologia Vol. 40, no. 4 (2003), s. 227-323