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@article{MASLO_2000__50_2_a6, author = {Hilscher, Roman}, title = {Spectral properties of general self-adjoint, even order differential operators}, journal = {Mathematica slovaca}, pages = {165--186}, publisher = {mathdoc}, volume = {50}, number = {2}, year = {2000}, mrnumber = {1763119}, zbl = {0995.34077}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_2000__50_2_a6/} }
Hilscher, Roman. Spectral properties of general self-adjoint, even order differential operators. Mathematica slovaca, Tome 50 (2000) no. 2, pp. 165-186. http://geodesic.mathdoc.fr/item/MASLO_2000__50_2_a6/