@article{10_4064_fm209_3_4,
     author = {Jacek Graczyk},
     title = {Dynamics of circle maps with flat spots},
     journal = {Fundamenta Mathematicae},
     pages = {267--290},
     publisher = {mathdoc},
     volume = {209},
     number = {3},
     year = {2010},
     doi = {10.4064/fm209-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm209-3-4/}
}