00329nam a2200109Ia 4500008004100000082001800041100001900059245008900078260003200167300000900199650001100208060110s9999    xx            000 0 und d  a20.151bLAN/B  aLANCASTER, F.W  aBibliometric methods in assessing productivity and impact of researchcF.W Lancaster  bThe Executive officerc1991  a52p.  a20.151