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Benzofuro [2,3-d] pyridazines II. Etude des benzofuropyridazones, Michel Cugnon de Sevricourt, Max Robba, J. Heterocycl. Chem. 1977, Volume 14, pp. 777-780.
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https://www.jhetchem.com/cd2html.php?file=19770777
2)The Preparation of Some (1)-Benzofurano-(2,3-c)-(6H,12H-1)-benzoxepin-6-ones,Vernon G. S. Box and Yvette A. Jackson, Heterocycles Volume 20, Issue 5 ( May, 1, 1983 ), Pages 753-760.
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http://data.heterocycles.jp/FMPro?-db=journalred.fp5&-format=/w7/JournalDetail.html&-lay=data&-Token.0=aka&-Token.3=R-1983-05-0753&-recid=38666&-Script=citation&-find
3)Synthesis of 3-(2-amino-2-carboxyethyl)-2-carboxy-7-chlorobenzofuran,A. Prevysh-Kvinto and K. Byalovich,Chemistry of Heterocyclic Compounds, Volume 33, Number 8 /1997.
4)[1]Benzofuro[2,3-d]pyridazine III. Etude de la dichloro-1,4 benzofuropyridazine. Michel Cugnon de Sevricourt, Max Robba,J. Heterocycl. Chem.1978, Volume 15, pp. 977-979.
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https://www.jhetchem.com/cd2html.php?file=19780977
5)[1]Benzofuro[2,3-d]pyridazines IV. Etude de la chloro-4 benzofuropyridazine. Max Robba, Michel Cugnon de Sevricourt, Anne-Marie Godard. J. Heterocycl. Chem. 1978, Volume 15, pp. 1387-1391.
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https://www.jhetchem.com/cd2html.php?file=19781387
6)[1]Benzofuro[2,3-d]pyridazines. V. Etude de l'oxo-4 tetrahydro-1,2,3,4[1]benzofuro[2,3-d]pyridazine. Michel Cugnon de Sevricourt, Anne-Marie Godard, Max Robba. J. Heterocycl. Chem. 1979, Volume 16, Abstracts, pp. 745-749
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https://www.jhetchem.com/cd2html.php?file=19790745
