A. W. Cornelissen G. A. Bakkeren J. D. Barry P. A. Michels Piet Borst Characteristics of trypanosome variant antigen genes active in the tsetse fly. 4661-4676 1985 13 Nucleic Acids Research 13 db/journals/nar/nar13.html#CornelissenBBMB85 http://dx.doi.org/10.1093/nar/13.13.4661