1. (1) Iseki, S. and Sakai, T.: Artificial transformation of 0 antigens in Salmonella E group., II. Antigen-transforming factor in bacilli of subgroup E2., Proc. Jap. Acad., 29 (3) , 127-131, 1953.
2. (2) Sakai, T. and Iseki, S.: Artificial transformation of 0 antigens in Salmonella E group., III. Physicochemical properties of antigen-transforming factor in bacilli of subgroup E2., Gunma J. Med. Sc., II, (3) , 235-238, 1953.
3. (3) Hershey, A.D.: Spontaneous mutations in bacterial viruses., Cold Spring Harbor Symposium on Quantitative Biology, 11, 67-77, 1946.
4. (4) Doermann, A.H.: Lysis and lysis inhibition with E. coli bacteriophage., J. Bact., 55, 257-276, 1948.
5. (5) Adams, M.H.: Methods of study of bacterial viruses, Method in Medical Research., 2, 1-73, 1950, The Year Book Publishers, Chicago.