@article{1178242725, author = {Bullen, P. S.}, title = {A constructive definition of an integral}, journal = {Tohoku Math. J. (2)}, volume = {22}, number = {4}, year = {1970}, pages = { 597-603}, language = {en}, url = {http://dml.mathdoc.fr/item/1178242725} }
Bullen, P. S. A constructive definition of an integral. Tohoku Math. J. (2), Tome 22 (1970) no. 4, pp. 597-603. http://gdmltest.u-ga.fr/item/1178242725/