METHOD OF STATIONARY PHASE Статья ISAKOVA E.K. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. Том 237. 1977. С. 28-31
STRING-LIKE SOLUTIONS TO KLEIN-GORDON NONLINEAR EQUATION Статья TERLETSKII J.P. Doklady Akademii nauk SSSR. Mezhdunarodnaya Kniga, Moscow, Russian Federation. Том 236. 1977. С. 828-829