@Article{zbMATH03270165,
Author = {E. {Hopf}},
Title = {{Generalized solutions of non-linear equations of first order}},
FJournal = {{Journal of Mathematics and Mechanics}},
Journal = {{J. Math. Mech.}},
ISSN = {0095-9057},
Volume = {14},
Pages = {951--973},
Year = {1965},
Publisher = {Indiana University, Department of Mathematics, Bloomington, Indiana},
Language = {English},
Zbl = {0168.35101}
}