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4. Ghittino, P., 1963. Caso di epatoma nel Salmerino di allevamento (Salvelinus fontinalis) Atti. Soc. Ital. Sci. Vet., 17: 574-579.
5. Haddow, A. and Blake, 1933. Neoplasms in fish: a report of six cases with a summary of the literature. ]. Path. Bact., 36: 41-47.