't Hooft and Polyakov independently discover smooth monopoles in nonabelian gauge theories. Polyakov's paper placed them in a broader framework of topological solitons, while 't Hooft's paper highlighted their similarity with Dirac's magnetic monopoles.

G. 't Hooft, *Magnetic monopolesin unified gauge theories*, Nuclear Physics B79 (1974) 276-284

A. M. Polyakov, *Particle spectrum in quantum field theory*, ZhETF Pis. Red. 20, No. 6, 430-433