@article{10_1090_S0894_0347_97_00217_8,
     author = {Schlag, W.},
     title = {A generalization of {Bourgain\^a€™s} circular maximal theorem},
     journal = {Journal of the American Mathematical Society},
     pages = {103--122},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1997},
     doi = {10.1090/S0894-0347-97-00217-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-97-00217-8/}
}