Geodesic
The fourth oriented cobordism group~$\Omega _4$ is isomorphic to~$\mathbb Z$
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 5, Tome 267 (2000), pp. 282-289

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V. A. Rokhlin theorem indicated in the title is proved with using generic maps. 
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     author = {A. Sz\'{u}cs},
     title = {The fourth oriented cobordism group~$\Omega _4$ is isomorphic to~$\mathbb Z$},
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     volume = {267},
     year = {2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_267_a20/}
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A. Szűcs. The fourth oriented cobordism group~$\Omega _4$ is isomorphic to~$\mathbb Z$. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 5, Tome 267 (2000), pp. 282-289. http://geodesic.mathdoc.fr/item/ZNSL_2000_267_a20/