@article{TUW-105522, author = {Wallner, Oswald and Leeb, Walter and Winzer, Peter}, title = {Minimum length of a single-mode fiber spatial filter}, journal = {Journal of the Optical Society of America A}, year = {2002}, volume = {vol. 19}, number = {no. 12}, pages = {2445--2448}, url = {http://publik.tuwien.ac.at/files/pub-et_6076.pdf} }