M. L. Glasser. Exponentials of Certain Hilbert Space Operators. SIAM Review, 33(3):472, 1991. [doi]
@article{Glasser91, title = {Exponentials of Certain Hilbert Space Operators}, author = {M. L. Glasser}, year = {1991}, doi = {10.1137/1033103}, url = {http://dx.doi.org/10.1137/1033103}, researchr = {https://researchr.org/publication/Glasser91}, cites = {0}, citedby = {0}, journal = {SIAM Review}, volume = {33}, number = {3}, pages = {472}, }