author = { Lilja, I. A. AND Hämäläinen, R. M. K. },

title = { Notes on quantum mechanical sum rules },

publisher = {Societas Scientiarum Fennica},

year = {1970},

booktitle = {Commentationes physico-mathematicae ; 40,3,[6]},

address = { Helsinki },

url = { http://slubdd.de/katalog?TN_libero_mab2 }