@article{10_1017_S0017089514000056,
     author = {KEIL, EUGEN},
     title = {ON {A} {DIAGONAL} {QUADRIC} {IN} {DENSE} {VARIABLES}},
     journal = {Glasgow mathematical journal},
     pages = {601--628},
     year = {2014},
     volume = {56},
     number = {3},
     doi = {10.1017/S0017089514000056},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089514000056/}
}