Boundary value problems for composite type systems of first order partial differential equations
1979 ◽
pp. 600-614
1989 ◽
Vol 11
(3-4)
◽
pp. 173-183
◽
2008 ◽
Vol 19
(3)
◽
pp. 211-233
◽
1976 ◽
Vol 10
(3)
◽
pp. 527-533
◽