Vortices   back  
Vortices in Ginzburg-Landau theory [1, chapter 7.1]
                                                                                
Topological charge [1, chapter 7.2 and 7.3]
                                                                                
Dynamics of vortices [1, chapter 7.5 -- 7.7]

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[1] N. Manton, P. Sutcliffe, Topological solitons, Cambridge University
    Press (2004).