no. 4
The unbounded growth of solutions of linear parabolic differential equations
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 20 (1966) no. 4, pp. 719-732. 
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     title = {The unbounded growth of solutions of linear parabolic differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {719--732},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 20},
     number = {4},
     year = {1966},
     mrnumber = {206466},
     zbl = {0156.33402},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1966_3_20_4_719_0/}
}
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Besala, Piotr; Fife, Paul. The unbounded growth of solutions of linear parabolic differential equations. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 20 (1966) no. 4, pp. 719-732. http://archive.numdam.org/item/ASNSP_1966_3_20_4_719_0/

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