T. S. MOSTAFAEI, S. NAEM, M. IMANI, and N. DALIREZH, “Evidence for the presence of morphine like substance and μ opiate receptor expression in Dicrocoelium dendriticum (Trematoda: Dicrocoeliidae)”, J Hellenic Vet Med Soc, vol. 68, no. 3, pp. 385–390, Jan. 2018.