TY - JOUR AU - Hilscher, Roman TI - Spectral properties of general self-adjoint, even order differential operators JO - Mathematica slovaca PY - 2000 SP - 165 EP - 186 VL - 50 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MASLO_2000__50_2_a6/ LA - en ID - MASLO_2000__50_2_a6 ER -