@article{JRAM_1979__306_152094,
     author = {David W. Boyd and J. Michael Steele},
     title = {Monotone subsequences in the sequence of fractional parts of multiples of an irrational.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {49--59},
     publisher = {mathdoc},
     volume = {306},
     year = {1979},
     zbl = {0394.10019},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1979__306_152094/}
}