@Misc{ DufSuo18, author = { Dufloux, Laurent and Suomala, Ville }, title = { Projections of Poisson cut-outs in the Heisenberg group and the visual 3-sphere }, journal = { }, year = { 2018 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4575/ }, note = { cvgmt preprint} }