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_aLiustérnik, Lazar Aronovich _d1889- _98608 |
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_aLíneas más cortas : _bproblemas de variaciones / _cL. A. Liustérnik |
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_aMoscú : _bMir, _c1979 |
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_aTECNICAS VARIACIONALES _2EIT _922056 |
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_aMedkov, K. P. _etr. _99536 |
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