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Masahiko Takahashi, Toshiaki Orihara, Takanori Sasaki, Tetsuya Yamatera, Ken‘ichi Yamazaki, and Atomi Yoshida. Synthesis of 2H-Pyrazolo[3,4-b]pyridines from 1,1,2,2-Tetracyanocyclopropanes. Heterocycles. Vol 24, Issue 10, 1986, pp.2857-2862
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https://www2.heterocycles.jp/u2/library/FMPro?-db=journalred.fp5&-format=/w2/charge.html&-lay=data&-recid=42822&-Token.3=R-1986-10-2857&-Script=citingAndDuplicate&-Find
