Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Negru, S., and J. Ceianu. 1957. Contributiune la recunoasterea lui Ips duplicatus Sahib. si a vatamarii produse. An. Univ. "C. J. Parhon", Ser. Stiint Nat. 13:157-161.
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