Köhler H, Levitt D, Bach M
La Rabida-University of Chicago Institute and the Departments of Pathology, Biochemistry and Pediatrics, The University of Chicago, Chicago, IL 60649, U.S.A.
Immunol Today. 1981 Apr;2(4):58-60. doi: 10.1016/0167-5699(81)90015-3.