Donato, Andrea (2000) Legge di conservazione supplementare per un particolare sistema iperbolico del primo ordine. Memorie scientifiche di Andrea Donato, LXXVII. pp. 63-68.
We consider a hyperbolic system of first order obtained by reducing a conservative hyperbolic equation of second order in noncanonical form. We determine, generalizing a previous paper, the conditions for having a supplementary conservation law. As a particular case we obtain that teh second order equation must be of Euler type with the usual conservation law for the energy.
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