Asteroseismological analysis of the ultra-massive ZZ Ceti stars BPM 37093, GD 518, and SDSS J0840+5222Alejandro H. Córsico, Francisco C. De Gerónimo, María E. Camisassa and Leandro G. AlthausA&A, 632 (2019) A119DOI: https://doi.org/10.1051/0004-6361/201936698
