@article{10_4064_ap_49_3_209_219,
     author = {J. Tervo},
     title = {On algebraic characterization of coercive linear partial differential operators with constant coefficients},
     journal = {Annales Polonici Mathematici},
     pages = {209--219},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {1988},
     doi = {10.4064/ap-49-3-209-219},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-49-3-209-219/}
}