1. The Theory of Graphs and Its Applications;Berge,1962
2. On Gruebler's formulae for mechanisms;Bottema,1950
3. Finite Graphs and Networks;Busacker,1965
4. A contribution to Gruebler's Theory in the number synthesis of plane mechanisms;Crossley;J. Engng. Ind.,1964
5. The permutations of kinematic chains of eight members or less from the Graph-Theoretic viewpoint;Crossley,1965