High spin structures in the $A\approx 40$ mass region: from   superdeformation to extreme deformation and clusterization (an example of   $^{28}$Si)
  The search for extremely deformed structures in the yrast and near-yrast region of $^{28}$Si has been performed within the cranked relativistic mean field theory up to spin $I=20\hbar$. The fingerprints of clusterization are seen (well pronounced) in the superdeformed (hyperdeformed) configurations. 
A. V. Afanasjev and D. Ray
nucl-th