Wysokińska, Magdalena. 2004. “A Class of Real Cocycles over an Irrational Rotation for Which Rokhlin Cocycle Extensions Have Lebesgue Component in the Spectrum”. Topological Methods in Nonlinear Analysis 24 (2):387-407. https://apcz.umk.pl/TMNA/article/view/TMNA.2004.034.