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2. B. Foltman and V. B. Pederson, “Acid Proteases,” in Advances in Experimental Medicine and Biology, ed. by J. Tang, Vol. 95, Plenum Press, New York and London, 1977, pp. 2~22.
3. I-N. Hsu, L. T. J. Delbaere, M. N. G. James and T. Hofmann, “Acid Proteases,” in Advances in Experimental Medicine and Biology, ed by J. Tang, Vol. 95, Plenum Press, New York and London, 1977, pp. 61 —81.