Geodesic
The Quotient Space of C P (2) by Complex Conjugation is the 4-Sphere.
Mathematische Annalen, Tome 208 (1974), pp. 175-178 
Nikcolaas H. Kuiper. The Quotient Space of C P (2) by Complex Conjugation is the 4-Sphere.. Mathematische Annalen, Tome 208 (1974), pp. 175-178. http://geodesic.mathdoc.fr/item/MAN_1974__208_162566/
@article{MAN_1974__208_162566,
     author = {Nikcolaas H. Kuiper},
     title = {The {Quotient} {Space} of {C} {P} (2) by {Complex} {Conjugation} is the {4-Sphere.}},
     journal = {Mathematische Annalen},
     pages = {175--178},
     year = {1974},
     volume = {208},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__208_162566/}
}
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