@article{hitrik:hal-01219734,
TITLE = {Short-time asymptotics of the regularizing effect for semigroups generated by quadratic operators},
AUTHOR = {Hitrik, Michael and Pravda-Starov, Karel and Viola, Joe},
URL = {https://hal.science/hal-01219734},
NOTE = {46 pages. arXiv admin note: text overlap with arXiv:1411.6223},
JOURNAL = {Bulletin des Sciences Math{\'e}matiques},
PUBLISHER = {Elsevier},
VOLUME = {141},
NUMBER = {7},
PAGES = {615-675},
YEAR = {2017},
DOI = {10.1016/j.bulsci.2017.07.003},
KEYWORDS = {Quadratic operators ; smoothing effect ; hypoellipticity ; subelliptic estimates},
HAL_ID = {hal-01219734},
HAL_VERSION = {v1},
}