@article{JTNB_1992__4_1_19_0,
     author = {Mollin, R. A. and Williams, H. C.},
     title = {On the period length of some special continued fractions},
     journal = {S\'eminaire de th\'eorie des nombres de Bordeaux},
     pages = {19--42},
     publisher = {Universit\'e Bordeaux I},
     volume = {Ser. 2, 4},
     number = {1},
     year = {1992},
     mrnumber = {1183916},
     zbl = {0766.11003},
     language = {en},
     url = {http://www.numdam.org/item/JTNB_1992__4_1_19_0/}
}