@Article{ ROSALES_Branco_Torrão:1-13,

author = { JOSE CARLOS ROSALES GONZALEZ and Manuel M. Branco and Denise Torrão } ,

title = { Sets of positive integers closed under product and the number of decimal digits },

journal = { Journal of Number Theory },

year = { 2015 },

volume = { 147 },

pages = { 1-13 },

doi = { http://www.sciencedirect.com/science/article/pii/S0022314X14002200 },

}