no. 2
A maximum principle for nonlinear parabolic equations
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 2, pp. 291-305 
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     author = {Aronson, D. G. and Serrin, James},
     title = {A maximum principle for nonlinear parabolic equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {291--305},
     year = {1967},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 21},
     number = {2},
     mrnumber = {219901},
     zbl = {0148.34803},
     language = {en},
     url = {https://www.numdam.org/item/ASNSP_1967_3_21_2_291_0/}
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Aronson, D. G.; Serrin, James. A maximum principle for nonlinear parabolic equations. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 2, pp. 291-305. https://www.numdam.org/item/ASNSP_1967_3_21_2_291_0/

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