Petrović, MiroslavAleksić Lampert, TatjanaSimic, Visnja2023-03-012023-03-0120110024-3795https://scidar.kg.ac.rs/handle/123456789/16854Among the cacti with vertices and cycles we determine a unique cactus whose least eigenvalue is minimal. We also explore cacti with vertices and among them, we find a unique cactus whose least eigenvalue is minimal.enGraphCactusAdjacency spectrumLeast eigenvaluearticle10.1016/j.laa.2011.02.011