White dwarfs as probes of fundamental physics: tracers of planetary, stellar and galactic evolution : proceedings of the 357th symposium of the International Astronomical Union held in Hilo, Hawaii, USA, 21 - 25 October, 2019 - Barstow, Martin A.; Kleinman, Scott J.; Provencal, Judith L.; Ferrario, Lilia (Cambridge University Press, 2020)