@article{GDZPPN002350750, title = {Invariant Pseudo-Differential Operators.}, journal = {Mathematica Scandinavica}, volume = {28}, year = {1971}, pages = {105-123}, zbl = {0226.58010}, url = {http://dml.mathdoc.fr/item/GDZPPN002350750} }
Stetkaer, Henrik. Invariant Pseudo-Differential Operators.. Mathematica Scandinavica, Tome 28 (1971) pp. 105-123. http://gdmltest.u-ga.fr/item/GDZPPN002350750/