@article{PORMA_1996__53_3_47640,
     author = {Pilipovi\'c, S. and Scarpal\'ezos, D.},
     title = {Differential operators with generalized constant coefficients.},
     journal = {Portugaliae mathematica},
     pages = {305--324},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {1996},
     zbl = {0861.35132},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_3_47640/}
}