- DAVE AUCKLY, LEV KAPITANSKI, “THE PONTRJAGIN–HOPF INVARIANTS FOR SOBOLEV MAPS”, Commun. Contemp. Math., 12, no. 01, 2010,
121 
- Dave Auckly, Lev Kapitanski, “Analysis of S2-Valued Maps and Faddeev’s Model”, Commun. Math. Phys., 256, no. 3, 2005,
611 - T. Xu, “Kinetic helicity of vortex in Bose-Einstein condensates”, Eur. Phys. J. D, 38, no. 1, 2006,
93 - Alexander P Protogenov, Evgueni V Chulkov, Jeffrey C Y Teo, “Topological phase states of theSU(3) QCD”, J. Phys.: Conf. Ser., 482, 2014,
012035