Nonequivalence of regular boundary points for the Laplace and nondivergence equations, even with continuous coefficients
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 1, pp. 159-163. 
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     author = {Miller, Keith},
     title = {Nonequivalence of regular boundary points for the {Laplace} and nondivergence equations, even with continuous coefficients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {159--163},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 24},
     number = {1},
     year = {1970},
     mrnumber = {262677},
     zbl = {0202.11406},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1970_3_24_1_159_0/}
}
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Miller, Keith. Nonequivalence of regular boundary points for the Laplace and nondivergence equations, even with continuous coefficients. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 24 (1970) no. 1, pp. 159-163. http://www.numdam.org/item/ASNSP_1970_3_24_1_159_0/

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