@article{ASNSP_1973_3_27_1_97_0, author = {Bruckner, A. M. and Thorne, Charles L.}, title = {Density covers}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 27}, number = {1}, year = {1973}, pages = {97-104}, zbl = {0256.26004}, mrnumber = {417393}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1973_3_27_1_97_0} }
Bruckner, A. M.; Thorne, Charles L. Density covers. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 27 (1973) no. 1, pp. 97-104. http://www.numdam.org/item/ASNSP_1973_3_27_1_97_0/
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