Editing WKB approximation (section)

===Further reading===
*{{cite book | author=Child, M. S. | title=Semiclassical mechanics with molecular applications | year=1991 | publisher = Clarendon Press | location=Oxford | isbn=0-19-855654-3}}
* {{cite book| last1=Fröman|first1=N. |last2= Fröman |first2= P.-O.| title=JWKB Approximation: Contributions to the Theory | publisher=North-Holland |location = Amsterdam | year=1965}}
*{{cite book | author=Griffiths, David J. | title=Introduction to Quantum Mechanics | edition = 2nd | publisher=Prentice Hall |year=2004 |isbn=0-13-111892-7}}
*{{citation|first=Brian C.|last=Hall | title=Quantum Theory for Mathematicians | series=Graduate Texts in Mathematics| volume=267 | publisher=Springer|year=2013|bibcode=2013qtm..book.....H | isbn=978-1461471158}}
*{{cite book | author=Liboff, Richard L. | title=Introductory Quantum Mechanics | edition = 4th | publisher=Addison-Wesley | year=2003 |isbn=0-8053-8714-5| author-link=Liboff, Richard L }}
*{{cite book | author=Olver, Frank William John |author-link=Frank William John Olver | title=Asymptotics and Special Functions | url=https://archive.org/details/asymptoticsspeci0000olve | url-access=registration | publisher=Academic Press | year=1974 | isbn=0-12-525850-X}}
*{{cite book | author=Razavy, Mohsen | title=Quantum Theory of Tunneling | url=https://archive.org/details/quantumtheoryoft0000raza | url-access=registration | publisher=World Scientific | year=2003 | isbn=981-238-019-1}}