Geodesic
Two algorithms for finding the projection of a point onto a nonconvex set in a normed space
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 53 (2013) no. 3, pp. 344-349

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Two iteration algorithms are proposed for finding the projection of a point onto a nonconvex set in a normed space, which is given by $f(x) = 0$ equation. For the first case the left hand side of this equation is supposed to satisfy the subordination condition, which generalizes the Lipshitz condition. For the second casethe continuity of $f$ function is supposed and an approximate algorithm of projection is constructed. 
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     author = {V. I. Zabotin and N. K. Arutyunova},
     title = {Two algorithms for finding the projection of a point onto a nonconvex set in a normed space},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2013_53_3_a3/}
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V. I. Zabotin; N. K. Arutyunova. Two algorithms for finding the projection of a point onto a nonconvex set in a normed space. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 53 (2013) no. 3, pp. 344-349. http://geodesic.mathdoc.fr/item/ZVMMF_2013_53_3_a3/