Ray theories for hyperbolic waves, kinematical conservation laws (KCL) and applications  

 - Bangalore:   Department of Mathematics, Indian Institute of Science:  2006 
 - Ray theory, for the construction of the successive positions of a wavefront governed by linear hyperbolic equations, is a method which had its origin from the work of Fermat (and related to Huygen’s method). However, for a nonlinear wavefront governed by  
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