@article{GDZPPN002412969,
title = {Projective Planes in Irreducible 3-Manifolds.},
journal = {Mathematische Zeitschrift},
volume = {135},
year = {1973},
pages = {305-318},
zbl = {0249.57003},
url = {http://dml.mathdoc.fr/item/GDZPPN002412969}
}
Swarup, G. Ananda. Projective Planes in Irreducible 3-Manifolds.. Mathematische Zeitschrift, Tome 135 (1973) pp. 305-318. http://gdmltest.u-ga.fr/item/GDZPPN002412969/