@article{RSMUP_2020__144__13_0,
     author = {Arroyo Paniagua, Mar{\'\i}a Jos\'e and Facchini, Alberto and Gran, Marino and Janelidze, George},
     title = {Unusual spectral categories},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {13--25},
     volume = {144},
     year = {2020},
     doi = {10.4171/rsmup/53},
     mrnumber = {4186443},
     zbl = {1465.18003},
     language = {en},
     url = {http://archive.numdam.org/articles/10.4171/rsmup/53/}
}