Renewal theory in r dimensions (I)
Compositio Mathematica, Volume 21 (1969) no. 4, p. 383-399 
@article{CM_1969__21_4_383_0,
     author = {Stam, A. J.},
     title = {Renewal theory in $r$ dimensions (I)},
     journal = {Compositio Mathematica},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {4},
     year = {1969},
     pages = {383-399},
     zbl = {0192.54601},
     mrnumber = {261714},
     language = {en},
     url = {http://www.numdam.org/item/CM_1969__21_4_383_0}
}

Stam, A. J. Renewal theory in $r$ dimensions (I). Compositio Mathematica, Volume 21 (1969) no. 4, pp. 383-399. http://www.numdam.org/item/CM_1969__21_4_383_0/

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