@article{1102992206, author = {Tucker, Richard R.}, title = {The $\delta^{2}$-process and related topics.}, journal = {Pacific J. Math.}, volume = {23}, number = {3}, year = {1967}, pages = { 349-359}, language = {en}, url = {http://dml.mathdoc.fr/item/1102992206} }
Tucker, Richard R. The $\delta^{2}$-process and related topics.. Pacific J. Math., Tome 23 (1967) no. 3, pp. 349-359. http://gdmltest.u-ga.fr/item/1102992206/