Geodesic
On the Average Number of Crossings of a Level by the Sample Functions of a Stochastic Process
Teoriâ veroâtnostej i ee primeneniâ, Tome 5 (1960) no. 3, pp. 352-357 
V. A. Ivanov. On the Average Number of Crossings of a Level by the Sample Functions of a Stochastic Process. Teoriâ veroâtnostej i ee primeneniâ, Tome 5 (1960) no. 3, pp. 352-357. http://geodesic.mathdoc.fr/item/TVP_1960_5_3_a6/
@article{TVP_1960_5_3_a6,
     author = {V. A. Ivanov},
     title = {On the {Average} {Number} of {Crossings} of a {Level} by the {Sample} {Functions} of a {Stochastic} {Process}},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
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     volume = {5},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1960_5_3_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A strict derivation is given of the formula for the average number of times a fixed level is crossed by the sample functions of stochastic processes of some class.