Two different gauge-invariant models in the Lagrangian approach
  We show how to systematically derive the complete set of the gauge transformations of different types of the gauge invariant models, which are the chiral Schwinger and CP$^1$ with Chern-Simons term, in the Lagrangian Formalism. 
Seung-Kook Kim, Yong-Wan Kim and Young-Jai Park