Selbach, C., Soldánová, M., Georgieva, S., Kostadinova, A., Kalbe, M., & Sures, B. (2014). Morphological and molecular data for larval stages of four species of Petasiger Dietz, 1909 (Digenea: Echinostomatidae) with an updated key to the known cercariae from the Palaearctic. Systematic Parasitology, 89(2), 153-166. doi:10.1007/s11230-014-9513-4.