@article{1250283583,
author = {Nishitani, Tatsuo},
title = {Non effectively hyperbolic operators, Hamilton map and bicharacteristics},
journal = {J. Math. Kyoto Univ.},
volume = {44},
number = {4},
year = {2004},
pages = { 55-98},
language = {en},
url = {http://dml.mathdoc.fr/item/1250283583}
}
Nishitani, Tatsuo. Non effectively hyperbolic operators, Hamilton map and bicharacteristics. J. Math. Kyoto Univ., Tome 44 (2004) no. 4, pp. 55-98. http://gdmltest.u-ga.fr/item/1250283583/