Jørgensen, R.J; Rønne, H; Helsted, C; Iskander, A.R. (1982). "Spread of infective Dictyocaulus viviparus larvae in pasture and to grazing cattle: Experimental evidence of the role of Pilobolus fungi". Veterinary Parasitology. 10 (4): 331–339. doi:10.1016/0304-4017(82)90085-1. PMID6215761.
Jørgensen, R.J; Rønne, H; Helsted, C; Iskander, A.R. (1982). "Spread of infective Dictyocaulus viviparus larvae in pasture and to grazing cattle: Experimental evidence of the role of Pilobolus fungi". Veterinary Parasitology. 10 (4): 331–339. doi:10.1016/0304-4017(82)90085-1. PMID6215761.