@article{10_4153_S0008414X20000267,
     author = {Anedda, Claudia and Cuccu, Fabrizio and Frassu, Silvia},
     title = {Steiner symmetry in the minimization of the first eigenvalue of a fractional eigenvalue problem with indefinite weight},
     journal = {Canadian journal of mathematics},
     pages = {970--992},
     year = {2021},
     volume = {73},
     number = {4},
     doi = {10.4153/S0008414X20000267},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008414X20000267/}
}