@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/