Sabin, A B ON THE PRESENCE IN ANTIPNEUMOCOCCUS SERUM OF TYPE-SPECIFIC PROTECTIVE ANTIBODY NOT NEUTRALIZED BY HOMOLOGOUS SPECIFIC SOLUBLE SUBSTANCE. [electronic resource] - The Journal of experimental medicine Jan 1931 - 93-107 p. digital Publication Type: Journal Article ISSN: 0022-1007 Standard No.: 10.1084/jem.53.1.93 doi