Knowles, Ian. "On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions.." Mathematische Annalen 233 (1978): 221-228. <http://eudml.org/doc/163109>.
@article{Knowles1978, author = {Knowles, Ian}, journal = {Mathematische Annalen}, pages = {221-228}, title = {On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions.}, url = {http://eudml.org/doc/163109}, volume = {233}, year = {1978}, }
TY - JOUR AU - Knowles, Ian TI - On the Existence of Minimal Operators for Schrödinger-Type Differential Expressions. JO - Mathematische Annalen PY - 1978 VL - 233 SP - 221 EP - 228 UR - http://eudml.org/doc/163109 ER -