@article{10_4064_aa106_2_9,
     author = {Edward G. Belaga},
     title = {Effective polynomial upper bounds to perigees and
 numbers of $(3x+d)$-cycles of a given oddlength},
     journal = {Acta Arithmetica},
     pages = {197--206},
     publisher = {mathdoc},
     volume = {106},
     number = {2},
     year = {2003},
     doi = {10.4064/aa106-2-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa106-2-9/}
}