@article{1077310068,
author = {Thurber, Edward G.},
title = {On addition chains $1(mn)\leq 1(n)-b$
and lower bounds for
$c(r)$},
journal = {Duke Math. J.},
volume = {40},
number = {1},
year = {1973},
pages = { 907-913},
language = {en},
url = {http://dml.mathdoc.fr/item/1077310068}
}
Thurber, Edward G. On addition chains $1(mn)\leq 1(n)-b$
and lower bounds for
$c(r)$. Duke Math. J., Tome 40 (1973) no. 1, pp. 907-913. http://gdmltest.u-ga.fr/item/1077310068/