By J. F. Young and P. Palese. Proceedings of the National Academy of Sciences76(12),6547–6551(December1979). DOI doi.org/10.1073/pnas.76.12.6547
Abstract: oligonucleotide and peptide maps of A/Cal/10/78 support different parental origins for different influenza genome segments; inference distinguishes reassortment from sequential mutation.