000 00315nam a2200121Ia 4500
008 220201s1978 xx 000 0 eng d
082 _bHEA
100 _aHeaps, H S
245 0 _aInformation retrieval : computation & the oretical aspects
260 _aLondon
_bAcademic Press
_c1978
300 _a344
942 _2ddc
999 _c24683
_d24683