Iftichar Mudhar Talb Al-Shraa, Twist Periodic Orbits for Continuous Maps of the Eight Space, BSMaSS Volume 6, The Bulletin of Society for Mathematical Services and Standards (Volume 6)
https://www.scipress.com/BSMaSS.6.4
Abstract:
    Let g be a continuous map from 8 to itself has a fixed point at (0,0), we prove that g has a twist periodic orbit if there is a rational rotation number.
Keywords:
    Eight Space, Periodic Set, Rotation Set, Twist Map