O'Reilly, Oliver and Peter Varadi. "Hoberman's Sphere, Euler Parameters and Lagrange's Equations." Journal Journal of Elasticity 56/2 (August 1999): 171-180.

O'Reilly, Oliver and Peter Varadi. "Hoberman's Sphere, Euler Parameters and Lagrange's Equations." Journal Journal of Elasticity 56/2 (August 1999): 171-180.