@article{06f74d631b5341b4a01f49771ea661a9,
title = "A qualitative classification of extraterrestrial civilizations",
keywords = "Astrobiology, Extraterrestrial intelligence, History and philosophy of astronomy",
author = "Ivanov, {Valentin D.} and Beam{\'i}n, {Juan Carlos} and Claudio C{\'a}ceres and Dante Minniti",
note = "Funding Information: Acknowledgements. We thank the referees for the comments that helped to improve the paper and for pointing out the number of relevant works in the field of biology. We thank M.S. for the helpful discussions. D.M. acknowledges support from the BASAL Center for Astrophysics and Associated Technologies (CATA) through grant AFB 170002, and Proyecto FONDECYT No. 1170121. C.C. acknowledges support from DGI-UNAB project DI-11-19/R. JCB acknowledges support from project FONDECYT postdoctorado 3180716. Publisher Copyright: {\textcopyright} ESO 2020.",
year = "2020",
month = jul,
day = "14",
doi = "10.1051/0004-6361/202037597",
language = "English",
volume = "639",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}
