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1.
A. Salvatore 《Annali di Matematica Pura ed Applicata》1989,155(1):271-284
In questo lavoro si considera il problema
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2.
Yoshitaka Uda 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1995,46(3):366-383
We study nonnegative solutions of the initial value problem for a weakly coupled system
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