Geodesic
Small Systems of Generators of Groups
Matematičeskie zametki, Tome 76 (2004) no. 3, pp. 420-426
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A subset $S$ of a group $G$ is said to be large (left large) if there is a finite subset $K$ such that $G=KS=SK$ $(G=KS)$. A subset $S$ of a group $G$ is said to be small (left small) if the subset $G\setminus KSK$ $(G\setminus KS)$ is large (left large). The following assertions are proved: (1) every infinite group is generated by some small subset; (2) in any infinite group $G$ there is a left small subset $S$ such that $G=SS^{-1}$; (3) any infinite group can be decomposed into countably many left small subsets each generating the group. 
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     title = {Small {Systems} of {Generators} of {Groups}},
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     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_3_a10/}
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I. V. Protasov. Small Systems of Generators of Groups. Matematičeskie zametki, Tome 76 (2004) no. 3, pp. 420-426. http://geodesic.mathdoc.fr/item/MZM_2004_76_3_a10/

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