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

Quantification of chymosin and pepsin in bovine and calf rennetsVisser, S.; Friedenthal, Margus; Rollema, H.Proceedings of the XXII International Dairy Congress : the Hague 29 September - 30 October 19861986 / p. 78-79

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

Очистка и характеристика действия химозина при гидролизе синтетического субстратаAllmere, T.; Friedenthal, MargusXXXII студенческая научно-техническая конференция вузов Прибалтийских республик, Белорусской ССР и Молдавской ССР, 19-21 апреля 1988 г. : тезисы докладов : [в 3-х частях], ч. 21988 / с. 54 https://www.ester.ee/record=b1571601*est