@article{MZ_1992__210_1_174409,
     author = {E. Brian Davies and J. Martin Lindsay},
     title = {Non-commutative symmetric {Markov} semigroups.},
     journal = {Mathematische Zeitschrift},
     pages = {379--412},
     year = {1992},
     volume = {210},
     number = {1},
     zbl = {0761.46051},
     url = {http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174409/}
}