Laser spectroscopy of the 1S-2S transition in hydrogen and deuterium: Determination of the 1S Lamb shift and the Rydberg constant. - Boshier, MG; Baird, P; Foot, C; Hinds, E; Plimmer, MD; Stacey, D; Swan, J; Tate, D; Warrington, D; Woodgate, G (Physical review. A, 1989)