TY - JOUR AU - Jacob, Niels TI - Feller semigroups, Dirchlet forms, and pseudo differential operators. JO - Forum mathematicum PY - 1992 VL - 4 IS - 5 SP - 433 EP - 446 KW - pseudo-differential operator; self-adjoint extension; Feller semigroup UR - http://eudml.org/doc/141686 ER -