Spectroscopic and photometric periods of six ultracompact accreting binaries. - Green, Matthew J; Marsh, Thomas R; Carter, Philip J; Steeghs, Danny; Breedt, Elmé; Dhillon, V S; Littlefair, S P; Parsons, Steven G; Kerry, Paul; Gentile Fusillo, Nicola P; Ashley, R P; Bours, Madelon C P; et al. (Monthly Notices of the Royal Astronomical Society, 2020)