Spałek, J. t-J Model Then and Now: a Personal Perspective from the Pioneering Times // Acta Phys. Polon. A 111. 2007. DOI:10.12693/APhysPolA.111.409. с. 409.
Karchev, N. Generalized CP1 model from the t1-t2-J model // Phys. Rev. B 57. 1998. DOI:10.1103/PhysRevB.57.10913. с. 10913.