Geodesic
Twice differentiability of subharmonic functions
Izvestiya. Mathematics, Tome 41 (1993) no. 1, pp. 157-167 
S. A. Imomkulov. Twice differentiability of subharmonic functions. Izvestiya. Mathematics, Tome 41 (1993) no. 1, pp. 157-167. http://geodesic.mathdoc.fr/item/IM2_1993_41_1_a7/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that a subharmonic function is twice differentiable outside a set of small Lebesgue measure.

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