Deep optical observations of the γ-ray pulsar J0357+3205 A. Kirichenko, A. Danilenko, Yu. Shibanov, P. Shternin, S. Zharikov and D. Zyuzin A&A, 564 (2014) A81 Published online: 11 April 2014 DOI: 10.1051/0004-6361/201322628