Paul Sophus Epstein: Diferans ant vèsyon yo
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Liy 25 :
|author1=DuMond Jesse W. M.
| editor = National Academy of Sciences
|
| year = 1974
}}</ref>
|
Liy 25 :
|author1=DuMond Jesse W. M.
| editor = National Academy of Sciences
|
| year = 1974
}}</ref>
|