Haykin, D.J.: Subject headings: a practical guide (1951)
0.07
0.07020387 = product of:
0.14040774 = sum of:
0.14040774 = product of:
0.28081548 = sum of:
0.28081548 = weight(_text_:headings in 1724) [ClassicSimilarity], result of:
0.28081548 = score(doc=1724,freq=2.0), product of:
0.26202896 = queryWeight, product of:
4.849944 = idf(docFreq=940, maxDocs=44218)
0.054027215 = queryNorm
1.0716964 = fieldWeight in 1724, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
4.849944 = idf(docFreq=940, maxDocs=44218)
0.15625 = fieldNorm(doc=1724)
0.5 = coord(1/2)
0.5 = coord(1/2)