5. International Conference on Radiometry. Proceedings. Conference, Berlin (Germany), 19 - 21 Sep 1994.
50 Mbps free space direct detection laser diode optical communication system with Q = 4 PPM signaling
50K expander cycle engine demonstration
51 Tauri and the Hyades distance modulus
5577 A night airglow emission from Barth's and Chapman's mechanisms
5cm OH masers survey (Baudry+ 1997)
5d relativistic hydrodynamics and cosmology