@article{1102959507, author = {Johnson, G. D.}, title = {Superadditivity intervals and Boas' test.}, journal = {Pacific J. Math.}, volume = {43}, number = {3}, year = {1972}, pages = { 381-385}, language = {en}, url = {http://dml.mathdoc.fr/item/1102959507} }
Johnson, G. D. Superadditivity intervals and Boas' test.. Pacific J. Math., Tome 43 (1972) no. 3, pp. 381-385. http://gdmltest.u-ga.fr/item/1102959507/