@article{02012609, title = {The additive approximation on a four-variate Jensen-type operator equation.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2003}, year = {2003}, pages = {3171-3187}, doi = {10.1155/S0161171203210486}, zbl = {1064.47016}, language = {en}, url = {http://dml.mathdoc.fr/item/02012609} }
Wang, Jian. The additive approximation on a four-variate Jensen-type operator equation.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 3171-3187. doi : 10.1155/S0161171203210486. http://gdmltest.u-ga.fr/item/02012609/