POINT-STRUCTURE OBJECTS AND THE CLASSICAL SPIN MODEL Article Kuryshkin V.V., Èntralʹgo È.È. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. 1990.
AN ELLIPTIC FUNCTIONAL-DIFFERENTIAL EQUATION WITH CONTRACTIONS OF THE ARGUMENTS Article Rossovskiĭ L.E. Doklady Akademii Nauk. Vol. 411. 2006. P. 161-163