@article{10_1017_S0017089500006091,
     author = {Heath-Brown, D. R.},
     title = {Small solutions of quadratic congruences},
     journal = {Glasgow mathematical journal},
     pages = {87--93},
     year = {1985},
     volume = {26},
     doi = {10.1017/S0017089500006091},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006091/}
}