SCI Science Citation Index 1980 annual : part 13 permuterm subject index Rand-Z
Institute fo Scientific Information, 1981
 Buku Referensi
SCI Science Citation Index 1980 annual : part 11 permuterm subject index Diff-Leaf
Institute fo Scientific Information, 1981
 Buku Referensi
SCI Science Citation Index 1980 annual : part 10 permuterm subject index A-Diff
Institute fo Scientific Information, 1981
 Buku Referensi
SCI Science Citation Index 1980 annual : part 12 permuterm subject index Leaf-Rand
Institute fo Scientific Information, 1981
 Buku Referensi
Science
American Association for the Advancement of Science, 2018
 Majalah, Jurnal, Buletin
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