TY  - BOOK
AU  - Wightman A. S.
TI  - Troubles in the external field problem for invariant wave equations
T2  - Tracts in mathematics and natural sciences
U1  - CN2, L1 
PY  - 1971///
CY  - New York
PB  - Gordan and Beach Science USA   
KW  -  WAVE MECHANICS
KW  - PHYSICS
ER  -