2S 0142+61
2S 0142+61.
2S 0918-549 - Optical identification and study of a new distant low-mass X-ray binary
2S 1254-690
2S 1254-690
2S 1254-690
2S 1417-624
2S 1417-624
2S 1417-624 in Outburst
2S 1417-624 Outburst
2S 1553-542
2S 1553-54: Swift/XRT position
2S Hyperfine splitting of muonic hydrogen
2s Hyperfine Structure in Hydrogen Atom and Helium-3 Ion
2S hyperfine structure of atomic deuterium
2s-2p Transitions in the Spectra of CA XVII and TI XIX
2s-photoionisation of atomic magnesium: Shake processes and Coster-Kronig radiationless decay
2S1145-619 - an X-ray pulsar in an eccentric binary system
2S1417-624 - A variable galactic X-ray source near CG312-1
2sky 2.8, by Zerpec, Inc.