1. Review of Particle Properties, Rev. Mod. Phys. 52, No 2 (1980).
2. R?czka, R., ?A New Approach to Strong Interactions of Elementary Particles?, Preprint of the Institute of Nuclear Research, No 2/7/81, Warsaw, March 1981.
3. R?czka, R., ?Excited States of Mesons and Nucleons in Yukawa Type Models of Quantum Field Theories?, preprint of the Institute of Nuclear Research, No 3/7/81, Warsaw, March 1981.
4. BakerG.A.Jr. and KincaidJ.M., Phys. Rev. Lett. 42, 1431 (1979).
5. See, e.g., Ferrara, E., Riv. Nuovo Cim. 6, 199 (1976). Amaldi, E., Fubini, S., and Furlan, P., Electroproduction at Low Energy and Hadron Form Factors, Springer Tracts in Modern Physics, Vol. 83 (1979).