@article{106872, author = {Jaroslav Pol\'ak}, title = {Aggregation and disaggregation in Markov chains}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {031}, year = {1990}, pages = {403-404}, language = {en}, url = {http://dml.mathdoc.fr/item/106872} }
Polák, Jaroslav. Aggregation and disaggregation in Markov chains. Commentationes Mathematicae Universitatis Carolinae, Tome 031 (1990) pp. 403-404. http://gdmltest.u-ga.fr/item/106872/
On the convergence of Neumann series in Banach space, Math. Ann. 220 (1976), 143-146. (1976) | MR 0412855 | Zbl 0304.47016