@article{GDZPPN002085291,
title = {Upper bounds and conservativeness for semigroups associated with a class of Dirichlet forms generated by pseudo differential operators.},
journal = {Forum mathematicum},
volume = {8},
year = {1996},
pages = {107-120},
zbl = {0849.31014},
url = {http://dml.mathdoc.fr/item/GDZPPN002085291}
}
Hoh, Walter; Jacob, Niels. Upper bounds and conservativeness for semigroups associated with a class of Dirichlet forms generated by pseudo differential operators.. Forum mathematicum, Tome 8 (1996) pp. 107-120. http://gdmltest.u-ga.fr/item/GDZPPN002085291/