no. 2
Littlewood-Paley a priori estimates for parabolic equations with sub-Dini continuous coefficients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 2, pp. 305-334. 
@article{ASNSP_1979_4_6_2_305_0,
     author = {Fabes, E. and Sroka, S. and Widman, K.-O.},
     title = {Littlewood-Paley a priori estimates for parabolic equations with {sub-Dini} continuous coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {305--334},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 6},
     number = {2},
     year = {1979},
     mrnumber = {541451},
     zbl = {0427.35017},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1979_4_6_2_305_0/}
}
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Fabes, E.; Sroka, S.; Widman, K.-O. Littlewood-Paley a priori estimates for parabolic equations with sub-Dini continuous coefficients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 6 (1979) no. 2, pp. 305-334. http://archive.numdam.org/item/ASNSP_1979_4_6_2_305_0/

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