Vonsovsky S. V. Exciton approach to the description of the antiferromagnetic ground state in the Heisenberg and Hubbard model / S. V. Vonsovsky, V. Yu. Irkhin, M. I. Katsnelson // J. Magn. Magn. Mater. – 1986. – V. 58, Is. 3/4. – P. 309-312. – Bibliogr.: 10 ref.