THE ASYMPTOTIC BEHAVIOR AS TTOINFTY OF THE SOLUTION OF AN INITIAL-BOUNDARY VALUE PROBLEM IN THE THEORY OF INTERNAL WAVES Статья Maslennikova V.N., Petunin I.M. Дифференциальные уравнения. 1995.
DROPLET-LIKE SOLUTIONS TO THE EQUATIONS OF SCALAR NONLINEAR ELECTRODYNAMICS IN GENERAL RELATIVITY Статья Rybakov Yu.P., Saha B., Shikin G.N. Communications in Theoretical Physics (Allahabad). Том 3. 1994. С. 67-80