J. Schwinger, Ann. Phys. 2, 407 (1957)
M. Gell-Mann, M. Levy, Nuovo Cimento 16, 705 (1960)
N.A. Törnqvist, arXiv:hep-ph/0204215
F.E. Close, N.A. Törnqvist, J. Phys. G 28, R 249 (2002), arXiv:hep-ph/0204205
N.A. Törnqvist, Phys. Lett. B 619, 145 (2005), arXiv:hep-ph/0504204
M.R. Pennington, Int. J. Mod. Phys. A 21, 747 (2006), arXiv:hep-ph/0509265
R. Delbourgo, M.D. Scadron, Mod. Phys. Lett. A 10, 251 (1995), arXiv:hep-ph/9910242
R. Delbourgo, M.D. Scadron, Int. J. Mod. Phys. A 13, 657 (1998), arXiv:hep-ph/9807504
M. Schumacher, Eur. Phys. J. A 30, 413 (2006); M. Schumacher, Eur. Phys. J. A 32, 121 (2007) (E), arXiv:hep-ph/0609040
M.I. Levchuk, A.I. L’vov, A.I. Milstein, M. Schumacher, in Proceedings of the Workshop on the Physics of Excited Nucleons, NSTAR2005 (2005), p. 389, arXiv:hep-ph/0511193
E. van Beveren, F. Kleefeld, G. Rupp, M.D. Scadron, Phys. Rev. D 79, 098501 (2009), arXiv:0811.2589 [hep-ph]
I. Caprini, G. Colangelo, H. Leutwyler, Phys. Rev. Lett. 96, 132001 (2006), arXiv:hep-ph/0512364
E. van Beveren, D.V. Bugg, F. Kleefeld, G. Rupp, Phys. Lett. B 641, 265 (2006), arXiv:hep-ph/0606022
Particle Data Group, C. Amsler, Phys. Lett. B 667, 1 (2008)
M.R. Pennington, Phys. Rev. Lett. 97, 011601 (2006), arXiv:hep-ph/0604212
M.R. Pennington, Mod. Phys. Lett. A 22, 1439 (2007), arXiv:0705.3314 [hep-ph]
E. Klempt, A. Zaitsev, Phys. Rep. 454, 1 (2007), arXiv:0708.4016 [hep-ph]
M.R. Pennington, in 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2007), Julich, Germany, 10–14 Sept. 2007, p. 106, arXiv:0711.1435 [hep-ph]
M. Schumacher, Eur. Phys. J. A 31, 327 (2007), arXiv:0704.0200 [hep-ph]
M. Schumacher, Eur. Phys. J. A 34, 293 (2007), arXiv:0712.1417 [hep-ph]
M. Schumacher, in AIP Conference Proceedings 1030 (Workshop on Scalar Mesons and Related Topics Honoring Michael Scadrons’s 70th Birthday—SCADRON70) (2008), p. 129, arXiv:0803.1074 [hep-ph]; arXiv:0805.2823 [hep-ph]
M. Schumacher, Nucl. Phys. A 826, 131 (2009), arXiv:0905.4363 [hep-ph]
M. Schumacher, Prog. Part. Nucl. Phys. 55, 567 (2005), arXiv:hep-ph/0501167
D. Lurié, A.J. MacFarlane, Phys. Rev. B 136, 816 (1964)
T. Eguchi, Phys. Rev. D 14, 2755 (1976)
T. Eguchi, Phys. Rev. D 17, 611 (1978)
U. Vogl, W. Weise, Prog. Part. Nucl. Phys. 27, 195 (1991)
S.P. Klevansky, Rev. Mod. Phys. 64, 649 (1992)
V. de Alfaro, S. Fubini, G. Furlan, C. Rossetti, in Currents in Hadron Physics (North-Holland, Amsterdam, 1973), Chap. 5
T. Hatsuda, T. Kunihiro, Phys. Rep. 247, 221 (1994)
A.W. Thomas, W. Weise, The Structure of the Nucleon (Wiley-VCJ, Berlin, 2000)
A.I. L’vov, V.A. Petrun’kin, M. Schumacher, Phys. Rev. C 55, 359 (1997)
A.I. L’vov, A.M. Nathan, Phys. Rev. C 59, 1064 (1999)
M. Nagy, M.D. Scadron, G.E. Hite, Acta Phys. Slovaca 54, 427 (2004), arXiv:hep-ph/0406009
J.A. Oller, L. Roca, C. Schat, Phys. Lett. B 659, 201 (2008), arXiv:0708.1659 [hep-ph]
J.A. Oller, L. Roca, Eur. Phys. J. A 37, 15 (2008), arXiv:0804.0309 [hep-ph]
G. Mennessier, S. Narison, W. Ochs, Phys. Lett. B 665, 205 (2008), arXiv:0804.4452 [hep-ph]
G. Mennessier, S. Narison, W. Ochs, Nucl. Phys. Proc. Suppl. 181–182, 238 (2008), arXiv:0806.4092 [hep-ph]
M.R. Pennington, T. Mori, S. Uehara, Y. Watanabe, Eur. Phys. J. C 56, 1 (2008), arXiv:0803.3389 [hep-ph]
J. Bernabeu, T.E.O. Ericson, C. Ferro Fontan, Phys. Lett. B 49, 381 (1974)
J. Bernabeu, B. Tarrach, Phys. Lett. B 69, 484 (1977)
S.A. Coon, M.D. Scadron, Phys. Rev. C 23, 1150 (1981)
D.V. Bugg, M.D. Scadron, arXiv:hep-ph/0312346
D.V. Bugg, Eur. Phys. J. C 33, 505 (2004)
J. Bernabeu, J. Prades, Phys. Rev. Lett. 100, 241804 (2008), arXiv:0802.1830 [hep-ph]
J. Prades, J. Bernabeu, in 14th High-Energy Physics International Conference in Quantum Chromodynamics, Montpellier, France, 1–12 July 2008 (2008), arXiv:0809.2475 [hep-ph]
D. Babusci, G. Giordano, A.I. L’vov, G. Matone, A.M. Nathan, Phys. Rev. C 58, 1013 (1998)
G. Galler et al., Phys. Lett. B 501, 245 (2001)
S. Wolf et al., Eur. Phys. J. A 12, 231 (2001)
P.W. Higgs, Phys. Lett. 12, 132 (1964)
P.W. Higgs, Phys. Rev. Lett. 13, 508 (1964)
P.W. Higgs, Phys. Rev. 145, 1156 (1966)
M.D. Scadron, R. Delbourgo, G. Rupp, J. Phys. G 32, 735 (2006), arXiv:hep-ph/0603196
G.L. Castro, J. Pestieau, Mod. Phys. Lett. A 10, 1155 (1996), arXiv:hep-ph/9504350
Z.Y. Fang, G.L. Castro, M.J.L. Lucio, J. Pestieau, Mod. Phys. Lett. A 12, 1531 (1997), arXiv:hep-ph/9612430
K. Peters, in Proceedings of the XXIX Physics in Collision, arXiv:0911.1469 [hep-ex], and private communication
V. Lensky, V. Pascalutsa, Eur. Phys. J. C (2009). doi:10.1140/epjc/s10052-009-1183-z, arXiv:0907.0451 [hep-ph]