@unpublished{TUW-232935, author = {Leeb, Walter}, title = {Single-Photon Techniques for the Detection of Periodic Optical Signals}, year = {2014}, keywords = {pulsars, single-detection photon detection, detection of periodic lasr signals, SETI}, note = {invited; talk: Vienna Fast Photometer Mini-Workshop, Vienna University, Institut f{\"u}r Astrophysik; 2014-11-21} }