Geodesic
On the distribution of zeroes of extremal functions in $E_p$-classes in finitely connected domains
Matematičeskie zametki, Tome 16 (1974) no. 6, pp. 879-885.

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Previously known representations of extremal functions in terms of Green's and Neumann's functions are used for finding conditions which the zeroes of these functions must satisfy. 
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     author = {S. Ya. Khavinson},
     title = {On the distribution of zeroes of extremal functions in $E_p$-classes in finitely connected domains},
     journal = {Matemati\v{c}eskie zametki},
     pages = {879--885},
     publisher = {mathdoc},
     volume = {16},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_6_a3/}
}
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S. Ya. Khavinson. On the distribution of zeroes of extremal functions in $E_p$-classes in finitely connected domains. Matematičeskie zametki, Tome 16 (1974) no. 6, pp. 879-885. http://geodesic.mathdoc.fr/item/MZM_1974_16_6_a3/