@article {R{\"u}thing 1977a, title = {Kal(c)kbrenner, Gerhard (Calcificis, Hamontanus)}, journal = {Neue Deutsche Biographie }, volume = {11}, year = {1977}, note = {Elektronisch raadpleegbaar. }, pages = {62-63}, keywords = {biographiae, Gerardus Calcificis O.Cart. > Gerardus Kalckbrenner O.Cart., Gerardus Hamontanus O.Cart. > Gerardus Kalckbrenner O.Cart., Gerardus Kalckbrenner O.Cart. (biographia)}, author = {Heinrich R{\"u}thing} }