We prove that the Pontryagin sphere and the Pontryagin nonorientable surface occur as the Gromov boundary of a 7-systolic group acting geometrically on a 7-systolic normal pseudomanifold of dimension 3.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-fm207-1-4,
author = {Pawe\l\ Zawi\'slak},
title = {Trees of manifolds and boundaries of systolic groups},
journal = {Fundamenta Mathematicae},
volume = {209},
year = {2010},
pages = {71-99},
zbl = {1275.20048},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm207-1-4}
}
Paweł Zawiślak. Trees of manifolds and boundaries of systolic groups. Fundamenta Mathematicae, Tome 209 (2010) pp. 71-99. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm207-1-4/