1. Aigner, M. (1979): Combinatorial Theory. Springer-Verlag.
2. Amari, S. (1962): Topological foundations of Kron’s tearing of electric networks; Information-theoretical foundations of diakoptics and codiakoptics. RAAG Memoirs, Vol. 3, F-VI; F-VII, pp. 322–350; 351–371.
3. Asimov, L., and Roth, B. (1978): Rigidity of graphs. Transactions of the American Mathematical Society, Vol. 245, pp. 279–289.
4. Asimov, L., and Roth, B. (1979): Rigidity of graphs, II. Journal of Mathematical Analysis and Applications, Vol. 68, pp. 171–190.
5. Birkhoff, G. (1935): Sur les espaces discrets. Computes Rendus de l’Academie des Sciences, Paris, Tome 201, pp. 19–20.