@article{1102976976, author = {Swanson, C. A.}, title = {Comparison theorems for elliptic differential systems.}, journal = {Pacific J. Math.}, volume = {35}, number = {3}, year = {1970}, pages = { 445-450}, language = {en}, url = {http://dml.mathdoc.fr/item/1102976976} }
Swanson, C. A. Comparison theorems for elliptic differential systems.. Pacific J. Math., Tome 35 (1970) no. 3, pp. 445-450. http://gdmltest.u-ga.fr/item/1102976976/