Subaru optical observations of the two middle-aged pulsars PSR B0656+14 and GemingaY. A. Shibanov, S. V. Zharikov, V. N. Komarova, N. Kawai, Y. Urata, A. B. Koptsevich, V. V. Sokolov, S. Shibata and N. ShibazakiA&A, 448 1 (2006) 313-326DOI: https://doi.org/10.1051/0004-6361:20054178
