@article{10_4064_aa109_2_5,
     author = {Hizuru Yamagishi},
     title = {On the solutions of certain diagonal quadratic equations
 and {Lang's} conjecture},
     journal = {Acta Arithmetica},
     pages = {159--168},
     publisher = {mathdoc},
     volume = {109},
     number = {2},
     year = {2003},
     doi = {10.4064/aa109-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa109-2-5/}
}