On the existence of two-dimensional invariant tori for scalar parabolic equations with time periodic coefficients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 18 (1991) no. 3, p. 455-471 
@article{ASNSP_1991_4_18_3_455_0,
     author = {Dancer, Edward Norman},
     title = {On the existence of two-dimensional invariant tori for scalar parabolic equations with time periodic coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 18},
     number = {3},
     year = {1991},
     pages = {455-471},
     zbl = {0779.35049},
     mrnumber = {1145318},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1991_4_18_3_455_0}
}

Dancer, E. N. On the existence of two-dimensional invariant tori for scalar parabolic equations with time periodic coefficients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Volume 18 (1991) no. 3, pp. 455-471. http://www.numdam.org/item/ASNSP_1991_4_18_3_455_0/

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