Lang-Hinrichsen, DasStrafensystem, in Materialien zuf Strafrechtsreform (Materials for a Reform of Penal Law, Vol. II, Gen. pt., p. 33, 1954. Mueller, G. O. W. Punishment, Corrections and the Law, 45 Nebraska, Law Review, 58, 1966.
2.
Pfander H., Recueil de Documents en Matière Pénale et Pénitentiaire (Select Papers on Penal and Penitentiary Affairs, IPPC Bulletin,, Vol XV, Nos. 2/3, November 1950, pp. 238-258, Berne, Switzerland.
