no. 3
Returns to the origin for a randomized random walk
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 3, pp. 389-395. 
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     title = {Returns to the origin for a randomized random walk},
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     volume = {Ser. 3, 25},
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Gibson, A. E.; Conolly, B. W. Returns to the origin for a randomized random walk. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 25 (1971) no. 3, pp. 389-395. http://archive.numdam.org/item/ASNSP_1971_3_25_3_389_0/

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Conolly, B.W. (1971): On randomized random walks, SIAM Review, Vol. 13, N°. 1. | MR | Zbl

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