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@article{CMUC_1988__29_3_a10, author = {Sochor, Anton{\'\i}n}, title = {Addition of initial segments. {I.}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {501--517}, publisher = {mathdoc}, volume = {29}, number = {3}, year = {1988}, mrnumber = {972833}, zbl = {0658.03030}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1988__29_3_a10/} }
Sochor, Antonín. Addition of initial segments. I.. Commentationes Mathematicae Universitatis Carolinae, Tome 29 (1988) no. 3, pp. 501-517. http://geodesic.mathdoc.fr/item/CMUC_1988__29_3_a10/