The unbounded growth of solutions of linear parabolic differential equations
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 20 (1966) no. 4, p. 719-732 
@article{ASNSP_1966_3_20_4_719_0,
     author = {Besala, Piotr and Fife, Paul C.},
     title = {The unbounded growth of solutions of linear parabolic differential equations},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 20},
     number = {4},
     year = {1966},
     pages = {719-732},
     zbl = {0156.33402},
     mrnumber = {206466},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1966_3_20_4_719_0}
}

Besala, Piotr; Fife, Paul. The unbounded growth of solutions of linear parabolic differential equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Serie 3, Volume 20 (1966) no. 4, pp. 719-732. http://www.numdam.org/item/ASNSP_1966_3_20_4_719_0/

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