Hinds-Frey, K.R. & Nishikata, H. & Litman, R.T. & Litman, G.W. (1993)
Somatic variation precedes extensive diversification of germline sequences and combinatorial joining in the evolution of immunoglobulin heavy chain diversity. Journal of Experimental Medicine, 178(3), 815–824
DOI: 10.1084/jem.178.3.815