@article{10_4064_aa149_3_5,
     author = {Zhi-Hong Sun},
     title = {Congruences for $(A+\sqrt {A^2+mB^2})^{(p-1)/2}$ and
$(b+\sqrt{a^2+b^2})^{(p-1)/4}\pmod p$},
     journal = {Acta Arithmetica},
     pages = {275--296},
     publisher = {mathdoc},
     volume = {149},
     number = {3},
     year = {2011},
     doi = {10.4064/aa149-3-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa149-3-5/}
}