Chapter XVII. Equations of the Second Degree.
Algebra Part 1, GDML_Books, (1889), p. 396 / Harvested from
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@article{PPN585262896+DMDLOG_0021,
     title = {Chapter XVII. Equations of the Second Degree.},
     booktitle = {Algebra Part 1},
     series = {GDML\_Books},
     publisher = {Black},
     address = {Edinburgh},
     year = {1889},
     pages = {396},
     url = {http://dml.mathdoc.fr/item/PPN585262896+DMDLOG_0021}
}

 (éd.). Chapter XVII. Equations of the Second Degree., dans Algebra Part 1, GDML_Books,  (1889), p. 396. http://gdmltest.u-ga.fr/item/PPN585262896+DMDLOG_0021/