MathSciNet bibliographic data MR742889 (86i:57036) 57R40 (57M99) Lawson, Terry Detecting the standard embedding of ${\bf R}{\rm P}\sp{2}$${\bf R}{\rm P}\sp{2}$ in $S\sp{4}$$S\sp{4}$. Math. Ann. 267 (1984), no. 4, 439–448. Article

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