Geodesic
Refinement of the Plessner theorem and Plessner points for arbitrary harmonic functions
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2017), pp. 58-61

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The well-known theorem of Plessner obtained for arbitrary harmonic functions by Japanese mathematician S. Yamashita is refined. In addition, one result obtained by Prof. V. I. Gavrilov for meromorphic functions is extended to harmonic functions. 
@article{VMUMM_2017_4_a9,
     author = {S. L. Berberian},
     title = {Refinement of the {Plessner} theorem and {Plessner} points for arbitrary harmonic functions},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {58--61},
     publisher = {mathdoc},
     number = {4},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2017_4_a9/}
}
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S. L. Berberian. Refinement of the Plessner theorem and Plessner points for arbitrary harmonic functions. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (2017), pp. 58-61. http://geodesic.mathdoc.fr/item/VMUMM_2017_4_a9/