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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     pages = {389--395},
     year = {1971},
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     volume = {Ser. 3, 25},
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     mrnumber = {319286},
     zbl = {0234.60082},
     language = {en},
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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. https://www.numdam.org/item/ASNSP_1971_3_25_3_389_0/

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