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024 _a72927
037 _cTextual
040 _aCSL
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_cCSL
041 _aeng
082 _aB3340C, H4
100 _aSommerfeld Arnold
245 0 _aPartial differential equations in physics
260 _c1944
300 _ap.
_ccm.
650 _aPartial differential equations
942 _hB3340C, H4
_cTEXL
_2CC
999 _c36035
_d36035