On Wald's equation. Discrete time case
Séminaire de probabilités de Strasbourg, Tome 31 (1997), pp. 126-135. 
@article{SPS_1997__31__126_0,
     author = {Galtchouk, Leonid I. and Novikov, Alexandre A.},
     title = {On {Wald's} equation. {Discrete} time case},
     journal = {S\'eminaire de probabilit\'es de Strasbourg},
     pages = {126--135},
     publisher = {Springer - Lecture Notes in Mathematics},
     volume = {31},
     year = {1997},
     mrnumber = {1478723},
     zbl = {0882.60040},
     language = {en},
     url = {http://archive.numdam.org/item/SPS_1997__31__126_0/}
}
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Galtchouk, Leonid I.; Novikov, Alexandre A. On Wald's equation. Discrete time case. Séminaire de probabilités de Strasbourg, Tome 31 (1997), pp. 126-135. http://archive.numdam.org/item/SPS_1997__31__126_0/

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