Morihana, K., Tsujimoto, M. and Ebisawa, K. (2014) “X-Ray and Near-Infrared Spectroscopy of Dim X-Ray Point Sources Constituting the Galactic Ridge X-Ray Emission”, Acta Polytechnica CTU Proceedings, 1(1), pp. 222–226. doi: 10.14311/APP.2014.01.0222.