@article{00733294, title = {Operator equations, separation of variables and relativistic alterations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {18}, year = {1995}, pages = {59-62}, doi = {10.1155/S0161171295000068}, zbl = {0827.35004}, language = {en}, url = {http://dml.mathdoc.fr/item/00733294} }
Hermann, Robert A. Operator equations, separation of variables and relativistic alterations.. International Journal of Mathematics and Mathematical Sciences, Tome 18 (1995) pp. 59-62. doi : 10.1155/S0161171295000068. http://gdmltest.u-ga.fr/item/00733294/