2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5121We report on follow-up observations of double degenerate (DD) white dwarfs from the Supernovae Ia Progenitor Survey (SPY). Orbital parameters of four systems, including a massive short period system, are presented.in: "White Dwarfs", Proc. XIII Workshop on White Dwarfs, eds. D. de Martino, R. Kalytis, R. Silvotti, J.E. Solheim, Kluwer, in press 4 pages, 1 figureAstrophysicstext