@article{oai:teapot.lib.ocha.ac.jp:00034644,
 author = {Hori, Reiko and Yoshida, Hiroaki},
 issue = {2},
 journal = {お茶の水女子大學自然科學報告},
 month = {Dec},
 note = {application/pdf, 紀要論文, We calculate the spectrum radius of a convex sum of a free family of projections using the technique of Gerl and Woess for harmonic analysis of nonisotropic random walks on free groups. We use Voiculescu's R-transform for the additive free convolution to obtain the implicit relation on the resolvent function.},
 pages = {1--9},
 title = {The spectrum radii of free convex sums of projections},
 volume = {54},
 year = {2003}
}