2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/8126We have taken near-infrared (JHK) spectroscopic data of a sample of pre-CVs, in order to examine them for signatures of nuclear evolution. Here we present preliminary results for the three systems BPM 71214, RR Cae, and RE 1016-053.2 pages, 1 figure, needs asp2004.sty, to appear in: The astrophysics of cataclysmic variables and related objects, ASP Conf. Ser., eds. J.M. Hameury and J.P. LasotaAstrophysicstext