Harmonic superfields in N = 4 supersymmetric quantum mechanics. Ivanov, Evgeny A. (2011) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Hopf maps, lowest Landau level, and fuzzy spheres. Hasebe, Kazuki (2010) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]