1. A sequence of (± 1) determinants with large values;Clements,1965
2. Sur la fonction sommatoire de la fonction “somme des chiffres”;Delange;Enseign. Math. (2),1975
3. On the decimal representation of integers;Drazin,1952
4. The number of 1's in binary integers: bounds and extremal properties;Macilroy;SIAM J. Comput.,1974