Geodesic
On the interconnection of local and global approximations by holomorphic functions
Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 103-118.

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It is proved that if a function $f\in\operatorname{Lip}(\alpha,X)$, $\alpha>2/3$, can be approximated locally outside its zero set by holomorphic functions, then it can be approximated also on the whole compact set $X$. This implies that if $f\in\operatorname{Lip}(\alpha,X)$, $\alpha>2/3$, and $f^2$ can be approximated by holomorphic functions on $X$, then so can $f$. Bibliography: 5 titles. 
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P. V. Paramonov. On the interconnection of local and global approximations by holomorphic functions. Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 103-118. http://geodesic.mathdoc.fr/item/IM2_1983_20_1_a6/

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