Geodesic
An analog of the generalized Hardy–Littlewood problem with almost prime numbers
Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 81-94 
Zh. V. Piyadina. An analog of the generalized Hardy–Littlewood problem with almost prime numbers. Matematičeskie zametki, Tome 59 (1996) no. 1, pp. 81-94. http://geodesic.mathdoc.fr/item/MZM_1996_59_1_a7/
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     title = {An~analog of the generalized {Hardy{\textendash}Littlewood} problem with almost prime numbers},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We obtain an asymptotic formula for the number of solutions of the equation $m'-\varphi(u,v)=a$, where $m$ is an almost prime number, $\varphi(u,v)$ is a given binary quadratic form, and $a$ is an arbitrary fixed integer.

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