@article{1183737160, author = {Thomason, S. K.}, title = {On Initial Segments of Hyperdegrees}, journal = {J. Symbolic Logic}, volume = {35}, number = {1}, year = {1970}, pages = { 189-197}, language = {en}, url = {http://dml.mathdoc.fr/item/1183737160} }
Thomason, S. K. On Initial Segments of Hyperdegrees. J. Symbolic Logic, Tome 35 (1970) no. 1, pp. 189-197. http://gdmltest.u-ga.fr/item/1183737160/