@article{GDZPPN002195852,
title = {Monotone subsequences in the sequence of fractional parts of multiples of an irrational.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {310},
year = {1979},
pages = {49-59},
zbl = {0394.10019},
url = {http://dml.mathdoc.fr/item/GDZPPN002195852}
}
Boyd, David W.; Steele, J. Michael. Monotone subsequences in the sequence of fractional parts of multiples of an irrational.. Journal für die reine und angewandte Mathematik, Tome 310 (1979) pp. 49-59. http://gdmltest.u-ga.fr/item/GDZPPN002195852/