@article{IM_1978__47_142575,
     author = {Henryk Iwaniec},
     title = {Almost-Primes {Represented} by {Quadratic} {Polynomials.}},
     journal = {Inventiones mathematicae},
     pages = {171--188},
     year = {1978},
     volume = {47},
     zbl = {0389.10031},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__47_142575/}
}