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| volume=31
| pages=459
| doi=10.1063/1.1730376
| bibcode=1959JChPh..31..459A}}</ref> and early 1960s by Rahman<ref>{{cite journal | first1=A.
| last1=Rahman
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| year=1997
| volume=52
| pages=
| doi=10.1016/s0009-2509(97)00081-x
}}</ref> and Xu 1998.<ref>{{cite journal
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