no. R2
On the connection between the theory of signal flow graphs and the theory of directed graphs
Revue française d'informatique et de recherche opérationnelle. Série rouge, Tome 4 (1970) no. R2, pp. 3-9. 
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Niedereichholz, J. On the connection between the theory of signal flow graphs and the theory of directed graphs. Revue française d'informatique et de recherche opérationnelle. Série rouge, Tome 4 (1970) no. R2, pp. 3-9. http://www.numdam.org/item/M2AN_1970__4_2_3_0/

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