Pionic degrees of freedom in atomic nuclei and quasielastic knockout of pions by high-energy electronsV. G. Neudatchin, L. L. Sviridova, N. P. Yudin and S. N. YudinEur. Phys. J. A, 24 2 (2005) 217-222DOI: https://doi.org/10.1140/epja/i2004-10132-7