On maximum principles for non-hyperbolic partial differential operators
1957 ◽
Vol 6
(2)
◽
pp. 218-232
◽
1983 ◽
Vol 8
(6)
◽
pp. 643-665
◽
1974 ◽
Vol 77
(1)
◽
pp. 48-58
◽
1983 ◽
Vol 1
(3)
◽
pp. 77-92
◽
1980 ◽
Vol 77
(2)
◽
pp. 505-512
◽
Keyword(s):
Keyword(s):
1959 ◽
Vol 12
(1)
◽
pp. 37-66
◽
1980 ◽
Vol 38
(1)
◽
pp. 118-138
◽