@article{AFM_1989_14_1_a13,
     author = {Juha Honkala},
     title = {On number systems with negative digits},
     journal = {Annales Fennici Mathematici},
     pages = {149--156},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1989},
     doi = {10.5186/aasfm.1989.1411},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1989.1411/}
}