@article{1102978253,
author = {Johnson, H. H.},
title = {Determination of hyperbolicity by partial prolongations.},
journal = {Pacific J. Math.},
volume = {31},
number = {3},
year = {1969},
pages = { 679-695},
language = {en},
url = {http://dml.mathdoc.fr/item/1102978253}
}
Johnson, H. H. Determination of hyperbolicity by partial prolongations.. Pacific J. Math., Tome 31 (1969) no. 3, pp. 679-695. http://gdmltest.u-ga.fr/item/1102978253/