Geodesic
Representation of extremal functions in the classes $E_q$ in terms of Green's and Neumann's functions
Matematičeskie zametki, Tome 16 (1974) no. 5, pp. 707-716.

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We consider extremal problems in the classes $E_q$, $q\ge1$, in finitely connected domains and we establish a representation of extremal functions in terms of Green's and Neumann's functions. The equations which we obtain constitute an extension to the multiply connected case of known representation equations for extremal functions in the classes $H_q$ in the unit disk. 
@article{MZM_1974_16_5_a3,
     author = {S. Ya. Khavinson},
     title = {Representation of extremal functions in the classes $E_q$ in terms of {Green's} and {Neumann's} functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {707--716},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a3/}
}
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S. Ya. Khavinson. Representation of extremal functions in the classes $E_q$ in terms of Green's and Neumann's functions. Matematičeskie zametki, Tome 16 (1974) no. 5, pp. 707-716. http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a3/