Fröman N., Fröman P. O. JWKB Approximation: Contributions to the Theory, 1967. In Russian

Фрёман Н., Фрёман П. У. ВКБ-приближение.

Москва : Мир, 1967. — 168 с. — Мягкий переплёт, обычный формат.

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Fröman N., Fröman P. O. JWKB Approximation: Contributions to the Theory.

Moscow : Mir, 1967. — 168 pp. — Softcover, ordinary format.

Nanny Fröman (1918–2005) and Per Olof Fröman (1920–1998) were Swedish theoretical physicists renowned for their fundamental contributions to the theory and development of the Jeffreys–Wentzel–Kramers–Brillouin (JWKB) method. Their collaborative work is considered a classic and comprehensive study in the asymptotic analysis of differential equations in quantum mechanics.