... Scand. 17, 190 (1963) 'O. Neuenhoffer, G. Lehmann, D. Haberer, G. Stemie, Ann. 712, 208 (1968) 'G. Zvilichovsky, L. Heller, Tetrahedron Letters 1159 (1969) ' H. Cook and C A. Slater, J. Chem Soc.4130(1956) "A. Chimiak, Roczniki Chem. 42, 225 (1968) "A. Chimiak, T. Poj'onski, Proceedings of II Polish Meeting, Chemistry of Amino Acids and Peptides, Gdansk 1973 p. 58 "A. Chimiak, T. Kolasa m: Peptides 1972, Proc. I2th Europ. Pept Symp. ...