@article{10_1017_S001708959997060X,
     author = {GUERZHOY, P.},
     title = {Quadratic congruences for {Cohen{\textendash}Eisenstein} series},
     journal = {Glasgow mathematical journal},
     pages = {141--144},
     year = {1999},
     volume = {41},
     number = {1},
     doi = {10.1017/S001708959997060X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708959997060X/}
}