Abstract: Among all the n-vertex bicyclic graphs, the first eight largest Laplacian spectra radii had been obtained in the past, all of which are no smaller than n − 1. In this paper, it is first obtained that all the bicyclic graphs on n vertices with Laplacian spectra radii at least n − 2 must contain two adjacent vertices which cover all the vertices except possibly two and one of the two adjacent vertices must have the degree at least n−3. Then the total forty-two such graphs are further ordered, and the ninth to the forty-first largest Laplacian spectra radii among all the n-vertex bicyclic graphs are finally determined in this way.
DOI: *As the DOI is a unique identifier, it is already available in the pdf version. **The DOI link will be activated in the first midst of January 2026.
Guangqing Jin, Liancui Zuo, "On Further Ordering Bicyclic Graphs with Respect to the Laplacian Spectra Radius," WSEAS Transactions on Mathematics, vol. 12, pp. -, 2013, DOI:
Guangqing Jin, Liancui Zuo. On Further Ordering Bicyclic Graphs with Respect to the Laplacian Spectra Radius.
WSEAS Transactions on Mathematics. 2013;12:-.