000 00300nam a2200109Ia 4500
008 220204s9999 xx 000 0 und d
082 _a025.06
_bHEA
100 _aHeaps, H S
245 0 _aInformation retrieval: Computational and theoretical aspects
260 _aNew York
_bAcademic
_c1978
942 _cBK
999 _c30141
_d30141