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024 _a70114
037 _cTextual
040 _aCSL
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_cCSL
041 _aeng
082 _aB44, L61
100 _aUNESCO
245 0 _aCombinators graphs and algebra
260 _c1976
300 _ap.
_ccm.
650 _a Graph
650 _aMathematics
942 _hB44, L61
_cTEXL
_2CC
999 _c34183
_d34183