Sergey A. Efimov List of Articles: Efimov S. Mathematical simulation of invariant seismic experiments for research into requirements of equivalence conditions of sounding signals // Mathematical Modeling in Geophysics. — 2003 . — # 8. — P. 27-34 Efimov S. Effective algorithm of spectral estimation for extended realizations with any frequency entry point // Mathematical Modeling in Geophysics. — 1998 . — # 3. — P. 31-35