Enzyme adsorption and loss of activity in dilute solutions of chymosin and pepsin. Prevention with polyethylene glycol [milk products]Friedenthal, Margus; Visser, S.Netherlands milk and dairy journal1985 / p. 63-70

Spectrophotometric method for the determination of chymosin and pepsin in calf and adult bovine rennetsVisser, S.; Rollema, H; Friedenthal, Margus; van Alebeek, G.Netherlands milk and dairy journal1988 / p. 221-223