@article{ASCFM_1974__51_9_51_0, author = {Letac, G\'erard}, title = {Barycentres de matrices idempotentes stochastiques}, journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques}, volume = {51}, year = {1974}, pages = {51-61}, mrnumber = {362497}, zbl = {0292.60098}, language = {fr}, url = {http://dml.mathdoc.fr/item/ASCFM_1974__51_9_51_0} }
Letac, Gérard. Barycentres de matrices idempotentes stochastiques. Annales scientifiques de l'Université de Clermont. Mathématiques, Tome 51 (1974) pp. 51-61. http://gdmltest.u-ga.fr/item/ASCFM_1974__51_9_51_0/
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and : "