@article{Wang2023, 
author = {Dijian Wang and Dongdong Gao},
title = {Laplacian integral signed graphs with few cycles},
year = {2023},
journal = {AIMS Mathematics},
volume = {8},
number = {3},
pages = {7021-7031},
keywords = {spectrum, signed graph, Laplacian integral graph},
url = {https://www.sciopen.com/article/10.3934/math.2023354},
doi = {10.3934/math.2023354},
abstract = {A connected graph with    n vertices and    m edges is called    k-cyclic graph if    k  =  m  −  n  +  1. We call a signed graph is Laplacian integral if all eigenvalues of its Laplacian matrix are integers. In this paper, we will study the Laplacian integral    k-cyclic signed graphs with    k  =  0  ,  1  ,  2  ,    3 and determine all connected Laplacian integral signed trees, unicyclic, bicyclic and tricyclic signed graphs.}
}