@article{201909.0133,
	doi = {},
	url = {https://doi.org/},
	year = 2019,
	month = {September},
	publisher = {Preprints},
	author = {Christian Corda and Fabiano Feleppa and Ignazio Licata},
	title = {Hartle-Hawking boundary conditions as Nucleation by de Sitter Vacuum},
	journal = {Preprints}
}