Vennema, H., De Groot, R. J., Harbour, D. A., Horzinek, M. C., & Spaan, W. J. (1991). Primary structure of the membrane and nucleocapsid protein genes of feline infectious peritonitis virus and immunogenicity of recombinant vaccinia viruses in kittens. Virology.

Vennema, Harry, Raoul J. De Groot, David A. Harbour, Marian C. Horzinek, and Willy J.M Spaan. "Primary Structure of the Membrane and Nucleocapsid Protein Genes of Feline Infectious Peritonitis Virus and Immunogenicity of Recombinant Vaccinia Viruses in Kittens." Virology 1991.

Vennema, Harry, et al. "Primary Structure of the Membrane and Nucleocapsid Protein Genes of Feline Infectious Peritonitis Virus and Immunogenicity of Recombinant Vaccinia Viruses in Kittens." Virology 1991.