@article{DOCMA_2012__S3__a30,
     author = {Eisenbrand, Friedrich},
     title = {Pope {Gregory,} the calendar, and continued fractions},
     journal = {Documenta mathematica},
     pages = {87--93},
     publisher = {mathdoc},
     volume = {Optimization Stories},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_2012__S3__a30/}
}