Demiaszkiewicz, Aleksander W., Anna M. Pyziel, and Jacek Lachowicz. 2008. “Helminthological Status of European Bison in Białowiez˙a Forest in the Winter 2007/2008”. European Bison Conservation Newsletter 1 (September):42-52. http://ojs.wisent.org/index.php/czasopismo/article/view/5.