1. Allen, R.C., Moore, D.J., Dilworth, R.J.: A new rapid electrophoresis procedure employing pulsed power in gradient gels at a continuous pH: The effect of various discontinuous buffer systems on esterase zymograms. J. Histochem. Cytochem.17, 189?190 (1969)
2. Bowen, P.: Studies of pepsinogen isozymes in urine and gastric mucosa. Am. J. Hum. Gen.26, 16A (1974)
3. Cheret, A.M., Bonfils, S.: Etude électrophorétique des protéases du suc et de la muqueuse gastrique de différentes espèces animales. Path. Biol.16, 1061?1070 (1968)
4. Cuatrecasas, P.: Protein purification by affinity chromatography. J. Biol. Chem.245, 3059?3065 (1970)
5. Etherington, D.J., Taylor, W.H.: Nomenclature of the pepsins. Nature216, 279?280 (1967)