1. A summation formula involving Fibonacci digits;Coquet;J. Number Theory,1986
2. Formules sommatoires et systèmes de numération lies aux substitutions;Dumont,1987
3. Systems of numeration;Fraenkel;Am. Math. Monthly,1985
4. P. J. Grabner, Ziffernentwicklungen bezüglich linearer Rekursionen, Sitzungsber. Österr. Akad. Wiss., to appear.