Litman, G.W. & Hinds, K. & Berger, L. & Murphy, K. & Litman, R. (1985)
Structure and organization of immunoglobulin VH genes in Heterodontus, a phylogenetically primitive shark. Developmental and Comparative Immunology, 9(4), 749–758
DOI: 10.1016/0145-305X(85)90040-0

Litman, G.W. & Berger, L. & Murphy, K. & Litman, R. & Hinds, K. & Erickson, B.W. (1985)
Immunoglobulin VH gene structure and diversity in Heterodontus, a phylogenetically primitive shark. Proceedings of the National Academy of Sciences of the United States of America, 82(7), 2082–2086