@article{GDZPPN002475022, title = {Some General Instability Criteria (II).}, journal = {Monatshefte f\"ur Mathematik}, volume = {70}, year = {1966}, pages = {1-7}, zbl = {0152.08802}, url = {http://dml.mathdoc.fr/item/GDZPPN002475022} }
Burton, T.A. Some General Instability Criteria (II).. Monatshefte für Mathematik, Tome 70 (1966) pp. 1-7. http://gdmltest.u-ga.fr/item/GDZPPN002475022/