@article{MM2_1993__80_3_155868,
     author = {Pieter Moree},
     title = {On the number of y-smooth natural numbers ... representable as a sum of two integer squares.},
     journal = {Manuscripta mathematica},
     pages = {199--212},
     publisher = {mathdoc},
     volume = {80},
     number = {3},
     year = {1993},
     zbl = {0791.11046},
     url = {http://geodesic.mathdoc.fr/item/MM2_1993__80_3_155868/}
}