Local central limit theorem for first entrance of a random walk into a half space
Compositio Mathematica, Tome 23 (1971) no. 1, pp. 15-23.
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     author = {Stam, A. J.},
     title = {Local central limit theorem for first entrance of a random walk into a half space},
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     url = {http://archive.numdam.org/item/CM_1971__23_1_15_0/}
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Stam, A. J. Local central limit theorem for first entrance of a random walk into a half space. Compositio Mathematica, Tome 23 (1971) no. 1, pp. 15-23. http://archive.numdam.org/item/CM_1971__23_1_15_0/

A.J. Stam [1] Renewal Theory in r Dimensions I, Comp. Math. 21 (1969), 383-399; II, Comp. Math. 23 (1971), 1-13. | Numdam | MR 261714 | Zbl 0208.44302

K. Nevels [2] On Moments of Ladder Variables. Report T.W.-87, Mathematisch Instituut Rijksuniversiteit Groningen. (1970).