Geodesic
The occurrence of collapse for quasilinear equations of parabolic and hyperbolic types
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 10, Tome 69 (1977), pp. 77-102

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Collapse in finite time is established for part of the solutions of certain classes of quasilinear equations of parabolic and hyperbolic types, the linear part of which has general form. Certain hyperbolic equations having $L-M$ pairs belong to these classes. 
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     author = {V. K. Kalantarov and O. A. Ladyzhenskaya},
     title = {The occurrence of collapse for quasilinear equations of parabolic and hyperbolic types},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {77--102},
     publisher = {mathdoc},
     volume = {69},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_69_a5/}
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V. K. Kalantarov; O. A. Ladyzhenskaya. The occurrence of collapse for quasilinear equations of parabolic and hyperbolic types. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 10, Tome 69 (1977), pp. 77-102. http://geodesic.mathdoc.fr/item/ZNSL_1977_69_a5/