Defining and Computing Topological Persistence for 1-cocycles - Dan Burghelea; Tamal K. Dey (CoRR, 2010)

Persistence for Circle Valued Maps - Dan Burghelea; Tamal K. Dey (CoRR, 2011)

Topological Persistence for Circle-Valued Maps. - Dan Burghelea; Tamal K. Dey (Discret. Comput. Geom., 2013)

Topology of angle valued maps, bar codes and Jordan blocks. - Dan Burghelea; Stefan Haller (J. Appl. Comput. Topol., 2017)