Invariant Properties of Third-Order Non-hyperbolic Linear Partial Differential Operators
2009 ◽
pp. 154-169
◽
2008 ◽
pp. 199-212
◽
1983 ◽
Vol 8
(6)
◽
pp. 643-665
◽
1897 ◽
Vol s1-29
(1)
◽
pp. 439-477