Geodesic
On the constant in the definition of subexponential distributions
Teoriâ veroâtnostej i ee primeneniâ, Tome 44 (1999) no. 2, pp. 455-458 
B. A. Rogozin. On the constant in the definition of subexponential distributions. Teoriâ veroâtnostej i ee primeneniâ, Tome 44 (1999) no. 2, pp. 455-458. http://geodesic.mathdoc.fr/item/TVP_1999_44_2_a14/
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     author = {B. A. Rogozin},
     title = {On the constant in the definition of subexponential distributions},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {455--458},
     year = {1999},
     volume = {44},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1999_44_2_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We prove that the constant in the definition of subexponential distributions is equal to 2.