TY  - BOOK
AU  - Hellwig,Gunter
TI  - Differential operators of mathematical physics
PY  - 1967///
CY  - Reading, Mass.
PB  - Addison-Wesley
KW  - Differential equations, Partial
KW  - Hilbert space
KW  - Mathematical physics
N1  - Includes bibliographical references (p. 289-293) and index; Originally title; Differential Operatoren der mathematischen physics
ER  -