@article{10_4153_CJM_1985_021_1,
     author = {Williams, Kenneth S. and Friesen, Christian and Howe, Lawrence J.},
     title = {Criteria for {Biquadratic} {Residuacity} {Modulo} a {Prime} p involving {Quaternary} {Representations} of p},
     journal = {Canadian journal of mathematics},
     pages = {337--370},
     year = {1985},
     volume = {37},
     number = {2},
     doi = {10.4153/CJM-1985-021-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1985-021-1/}
}