@article {BraHasLan18,
	title = {On asymptotic expansions in spin-boson models},
	journal = {Ann. Henri Poincar{\'e}},
	volume = {19},
	number = {2},
	year = {2018},
	pages = {515{\textendash}564},
	issn = {1424-0637},
	doi = {10.1007/s00023-017-0625-7},
	url = {https://doi.org/10.1007/s00023-017-0625-7},
	author = {Br{\"a}unlich, Gerhard and Hasler, David and Markus Lange}
}
