Gauge groups and topological invariants of vacuum manifolds V. L. Golo; M. I. Monastyrsky — 1978 Annales de l'I.H.P. Physique théorique
Topological charges and high dimensional instantons V. L. Golo; M. I. Monastyrsky — 1978 Annales de l'I.H.P. Physique théorique