@article{GDZPPN002427141, title = {The Harmonic Functions of Mean Ergodic Markov Semigroups.}, journal = {Mathematische Zeitschrift}, volume = {180}, year = {1982}, pages = {543-552}, zbl = {0493.60078}, url = {http://dml.mathdoc.fr/item/GDZPPN002427141} }
Davies, Edward Brian. The Harmonic Functions of Mean Ergodic Markov Semigroups.. Mathematische Zeitschrift, Tome 180 (1982) pp. 543-552. http://gdmltest.u-ga.fr/item/GDZPPN002427141/