Rp. Manvelyan et Dh. Tchrakian, A HIERARCHY OF GAUGED GRASSMANIAN MODELS IN 4P DIMENSIONS WITH SELF-DUAL INSTANTONS, Physics letters. Section B, 352(3-4), 1995, pp. 321-326
We present a hierarchy of gauged Grassmanian models in 4p dimensions,
where the gauge field takes its values in the 2(2p-1) X 2(2p-1) chiral
representation of SO(4p). The actions of all these models are absolut
ely minimised by a hierarchy of self-duality equations, all of which r
educe to a single pair of coupled ordinary differential equations when
subjected to 4p dimensional spherical symmetry.