The paper Optical performance and radiation stability of polymer X-ray refractive nano-lenses written by Alexander Barannikov, Maxim Polikarpov, Petr Ershov, Vladimir Bessonov, Ksenia Abrashitova, Irina Snigireva, Vyacheslav Yunkin, Gleb Bourenkov, Thomas Schneider, Andrey A. Fedyanin and Anatoly Snigirev has been published in Journal of Synchrotron Radiation.