@Misc{ AltBal18a, author = { Altavilla, Amedeo and Ballico, Edoardo }, title = { Three Topological Results on the Twistor Discriminant Locus in the 4-Sphere }, journal = { Milan Journal of Mathematics }, year = { 2019 }, doi = { https://doi.org/10.1007/s00032-019-00292-5 }, pages = { 16 }, URL = { https://gecogedi.dimai.unifi.it/paper/305/ }, note = { cvgmt preprint} }