F. Bouchut et F. James, DUALITY SOLUTIONS FOR PRESSURELESS GASES, Comptes rendus de l'Academie des Sciences. Serie I, Mathematique, 326(9), 1998, pp. 1073-1078
We introduce the notion of duality solution for the system of pressure
less gases, which ensures existence for the Cauchy problem, and unique
ness under optimal conditions on initial data. (C) Academie des Scienc
es/Elsevier, Paris.