@article{JTNB_1991__3_1_43_0,
     author = {Erd\"os, P. and Shallit, J. O.},
     title = {New bounds on the length of finite pierce and {Engel} series},
     journal = {S\'eminaire de th\'eorie des nombres de Bordeaux},
     pages = {43--53},
     publisher = {Universit\'e Bordeaux I},
     volume = {Ser. 2, 3},
     number = {1},
     year = {1991},
     mrnumber = {1116100},
     zbl = {0727.11003},
     language = {en},
     url = {http://archive.numdam.org/item/JTNB_1991__3_1_43_0/}
}