Pionic degrees of freedom in atomic nuclei and quasielastic knockout of pions by high-energy electrons V. G. Neudatchin, L. L. Sviridova, N. P. Yudin and S. N. Yudin Eur. Phys. J. A, 24 2 (2005) 217-222 Published online: 11 March 2005 DOI: 10.1140/epja/i2004-10132-7