1. Virus particles and viral antigens in chicken tissues free of infectious avian leukosis virus;Dougherty,1967
2. Characteristics of two new avian tumor virus subgroups;Duff;Virology,1969
3. Conditional lethal mutants of avian sarcoma viruses. I. Physiology of ts 75 and ts 149;Friis;Virology,1971
4. Analysis of the defectiveness of Rous sarcoma virus. II. Specification of RSV antigenicity by helper virus;Hanafusa,1964
5. A cell-associated factor essential for formation of an infectious form of Rous sarcoma virus;Hanafusa,1970