Geodesic
On the existence of angular boundary values for polyharmonic functions in the unit ball
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 45, Tome 456 (2017), pp. 144-154

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We study boundary properties of polyharmonic functions. In particular, a criterion is obtained (in terms of the radial growth of th derivative) for the existence a.e. of angular boundary values for a polyharmonic function bounded in the unit ball. 
@article{ZNSL_2017_456_a11,
     author = {M. Ya. Mazalov},
     title = {On the existence of angular boundary values for polyharmonic functions in the unit ball},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {144--154},
     publisher = {mathdoc},
     volume = {456},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2017_456_a11/}
}
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M. Ya. Mazalov. On the existence of angular boundary values for polyharmonic functions in the unit ball. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 45, Tome 456 (2017), pp. 144-154. http://geodesic.mathdoc.fr/item/ZNSL_2017_456_a11/