Geodesic
Angular potential for solving an elliptic equation with variable coefficients
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 19 (1979) no. 3, pp. 652-664

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The theory of the angular potential is constructed for $k$-harmonic functions on the plane, i.e. for regular solutions of the equation $div(k(M)~grad~u)=0$. An example is given of application of the results to the construction of a closed solution of the problem on the jump of directional derivatives of $k$-harmonic functions. 
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     author = {P. N. Vabishchevich and S. A. Gabov},
     title = {Angular potential for solving an elliptic equation with variable coefficients},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     volume = {19},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_3_a8/}
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P. N. Vabishchevich; S. A. Gabov. Angular potential for solving an elliptic equation with variable coefficients. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 19 (1979) no. 3, pp. 652-664. http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_3_a8/