@article{10_4064_aa_56_3_271_277,
     author = {Toyokazu Hiramatsu and Yoshio Mimura},
     title = {On numbers of type $x^{2} + Ny^{2}$},
     journal = {Acta Arithmetica},
     pages = {271--277},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {1990},
     doi = {10.4064/aa-56-3-271-277},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-56-3-271-277/}
}