1. M. R. Pennington, “Structure of the Scalars,” in Proceedings of the 11th Intern. Conference on Meson-Nucleon Physics and Structure of the Nucleon, FZJ, Juelich, Sept. 10–14, 2007; http://ru.arxiv.org/abs/0711.1435 .
2. K. Nakamura et al. (Particle Data Group), J. Phys. G 37, 075021 (2010); http://pdg.lbl.gov/2010/reviews/rpp2010-rev-scalar-mesons.pdf ; Yu. A. Troyan et al., “Seeking and Research for Small-Mass Scalar Mesons in np → npπ+π− Reactions at P n = 5.20 GeV/s,” Preprint OIYaI R1-2008-100 (Dubna, 2008); http://arxiv.org/abs/0811.4078 ; M. K. Volkov, E. A. Kuraev, and Yu. M. Bystritsky, “Two-Photon Mechanism of Scalar Meson Production by Colliding Beams,” Phys. Part. Nucl. Lett. 7, 10 (2010).
3. A. V. Belonogov et al., “A Liquid Hydrogen Bubble Chamber of Volume 950 × 350 × 300 mm,” Nucl. Instrum. Methods Phys. Res. 20, 114–115 (1963).
4. A. P. Gasparyan et al., “Neutron (Stripping) Channel of JINR of High Energy Laboratory,” Prib. Tekh. Eksp., No. 2, 27–42 (1977).
5. K. Beshliu et al., “Channel Cross Sections of np Interaction Reactions with P n = 1–5 GeV/s,” Yad. Fiz. 63, 888 (1986); V. I. Moroz, A. V. Nikitin, and Yu. A. Troyan, “Division Methods of Nuclear Reactions Channels under Emission of Bubble Camera by Neutrons with Energy from 2 to 10 GeV,” Sov. J. Nucl. Phys. 9, 323 (1969); J. R. Berge, F. T. Solmitz, and H. D. Taft, “Kinematical Analysis of Interaction Vertices from Bubble Chamber Data,” Rev. Sci. Instrum. 32, 538–548 (1961).