Citation: Xh. Lei et al., DNA FRAGMENTS FROM REGIONS INVOLVED IN SURFACE-ANTIGEN EXPRESSION SPECIFICALLY IDENTIFY LISTERIA-MONOCYTOGENES SEROVAR-4 AND A SUBSET THEREOF - CLUSTER IIB (SEROTYPES 4B, 4D, AND 4E), Applied and environmental microbiology, 63(3), 1997, pp. 1077-1082