Ha, Nguyen Van. “The Description of Two New Species Helicometra Pisodonophi Sp. N. and Opecoelus Haduyngoi Sp. N. (Trematoda: Opecoelidae) from Marine Fishes in Ha Long Bay, Vietnam”. <i>Academia Journal of Biology</i> 34, no. 2 (June 5, 2012): 133–138. Accessed January 12, 2026. https://vjes.vast.vn/vjbio/article/view/949.