@article{ASCFPA_1989__93_8_119_0,
     author = {Van Casteren, J. A. and Demuth, M.},
     title = {On differences of heat semigroups},
     journal = {Annales scientifiques de l'Universit\'e de Clermont-Ferrand 2. S\'erie Probabilit\'es et applications},
     pages = {119--147},
     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {93},
     number = {8},
     year = {1989},
     mrnumber = {1052235},
     zbl = {0708.47026},
     language = {en},
     url = {http://www.numdam.org/item/ASCFPA_1989__93_8_119_0/}
}