Enzyme-linked immunosorbent assay (ELISA) for von Willebrand factor antigen (vWF:AG) using monoclonal antibodies to von Willebrand factor - Shima, M; Yoshioka, A; Yoshikawa, N; Tanaka, I; Imai, S; Tsubura, Y; Fukui, H (J Nara Med Assoc, 1986)