Efremenkova, V.M.; Kamenskaya, M.A.; Khutoretskii, V.M.: Sootnoshenien klassifikasionnykh sistem bazy dannykh Chemical Abstracts i sootvetstvuyushchikh ei chastei sistemy baz dannykh VINITI (1999)
0.02
0.01982961 = product of:
0.03965922 = sum of:
0.03965922 = product of:
0.07931844 = sum of:
0.07931844 = weight(_text_:i in 409) [ClassicSimilarity], result of:
0.07931844 = score(doc=409,freq=2.0), product of:
0.19033937 = queryWeight, product of:
3.7717297 = idf(docFreq=2765, maxDocs=44218)
0.050464742 = queryNorm
0.41672117 = fieldWeight in 409, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.7717297 = idf(docFreq=2765, maxDocs=44218)
0.078125 = fieldNorm(doc=409)
0.5 = coord(1/2)
0.5 = coord(1/2)