On absorption probabilities for a random walk between two different barriers
Annales de la Faculté des sciences de Toulouse : Mathématiques, Serie 6, Volume 1 (1992) no. 1, p. 95-103 
@article{AFST_1992_6_1_1_95_0,
     author = {El-Shehawy, Ahmed},
     title = {On absorption probabilities for a random walk between two different barriers},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 1},
     number = {1},
     year = {1992},
     pages = {95-103},
     zbl = {0765.60071},
     mrnumber = {1191730},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1992_6_1_1_95_0}
}

El-Shehawy, Ahmed. On absorption probabilities for a random walk between two different barriers. Annales de la Faculté des sciences de Toulouse : Mathématiques, Serie 6, Volume 1 (1992) no. 1, pp. 95-103. http://www.numdam.org/item/AFST_1992_6_1_1_95_0/

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