APA
Fröman N., Fröman P. O., . (1965). JWKB approximation. Contributions to the theory. Amsterdam: North-Holland.
Chicago
Fröman Nanny, Fröman P O, . 1965. JWKB approximation. Contributions to the theory. Amsterdam: North-Holland.
Harvard
Fröman N., Fröman P. O., . (1965). JWKB approximation. Contributions to the theory. Amsterdam: North-Holland.
MLA
Fröman Nanny, Fröman P O, . JWKB approximation. Contributions to the theory. Amsterdam: North-Holland. 1965.