APA (7th ed.) Citation
Fröman, N., & Fröman, P. O. (1965). JWKB approximation: Contributions to the theory. North-Holland.
Chicago Style (17th ed.) Citation
Fröman, Nanny, and P. O. Fröman. JWKB Approximation: Contributions to the Theory. Amsterdam: North-Holland, 1965.
MLA (9th ed.) Citation
Fröman, Nanny, and P. O. Fröman. JWKB Approximation: Contributions to the Theory. North-Holland, 1965.
Warning: These citations may not always be 100% accurate.