LIBRARY On the Convergence of the Perturbation Method (Journal of the Faculty of Science, University of Tokyo. Section 1. Mathematics, Astronomy, Physics, Chemistry. vol. 6. part 3, pp. 145 - 226, March 31, 1951) 1951 · ENGLISH · DJVU View details →
LIBRARY On the Convergence of the Perturbation Method (Journal of the Faculty of Science, University of Tokyo. Section 1. Mathematics, Astronomy, Physics, Chemistry. vol. 6. part 3, pp. 145 - 226, March 31, 1951) ENGLISH · PDF View details →
LIBRARY Perturbation Theory for Linear Operators, Second Edition (Classics in Mathematics) 1995 · ENGLISH · PDF View details →