@article{04180133, title = {Some spectral inclusions on D-commuting systems.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {115-120}, doi = {10.1155/S016117129000014X}, zbl = {0716.47002}, language = {en}, url = {http://dml.mathdoc.fr/item/04180133} }
Verma, R.U.; Jou, S.S. Some spectral inclusions on D-commuting systems.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 115-120. doi : 10.1155/S016117129000014X. http://gdmltest.u-ga.fr/item/04180133/