@article{JTNB_2002__14_2_603_0,
     author = {Van der Poorten, Alfred J.},
     title = {Symmetry and folding of continued fractions},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {603--611},
     publisher = {Universit\'e Bordeaux I},
     volume = {14},
     number = {2},
     year = {2002},
     mrnumber = {2040696},
     zbl = {1067.11001},
     language = {en},
     url = {http://www.numdam.org/item/JTNB_2002__14_2_603_0/}
}