@article{10_4153_S0008414X22000499,
     author = {Garza-Vargas, Jorge and Kulkarni, Archit},
     title = {Spectra of infinite graphs via freeness with amalgamation},
     journal = {Canadian journal of mathematics},
     pages = {1633--1684},
     year = {2023},
     volume = {75},
     number = {5},
     doi = {10.4153/S0008414X22000499},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X22000499/}
}