Clinical application of a chromogenic substrate method for determination of Factor VIII activity - Rosén, S; Andersson, M; Blombäck, M; Hägglund, U; Larrieu, M J; Wolf, M; Boyer, C; Rothschild, C; Nilsson, I M; Sjörin, E; Vinazzer, H (Thromb Haemost, 1985)