Characteristic equations of first-order nonlinear partial differential equations
2015 ◽
pp. 99-125
2020 ◽
pp. 101-128
1997 ◽
Vol 125
(5)
◽
pp. 1483-1485
◽
2015 ◽
pp. 1-47
2017 ◽
Vol 324
◽
pp. 72-84