braun, volkmar (October 10, 1969). "Chemical characterization, spatial distribution and function of a lipoprotein (murein-lipoprotein) of the E. coli cell wall. The specific effect of trypsin on the membrane structure". European journal of biochemistry: 426–38. doi:10.1111/j.1432-1033.1969.tb00707.x. PMID4899922. {{cite journal}}: |access-date= requires |url= (help)
McIntyre TM, Prescott SM, Weyrich AS, Zimmerman GA (2003). "Cell-cell interactions: leukocyte-endothelial interactions". Current Opinion in Hematology. 10 (2): 150–8. doi:10.1097/00062752-200303000-00009. PMID12579042.
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braun, volkmar (October 10, 1969). "Chemical characterization, spatial distribution and function of a lipoprotein (murein-lipoprotein) of the E. coli cell wall. The specific effect of trypsin on the membrane structure". European journal of biochemistry: 426–38. doi:10.1111/j.1432-1033.1969.tb00707.x. PMID4899922. {{cite journal}}: |access-date= requires |url= (help)