Long-range high-performance time-of-flight-based 3D imaging sensors. - Andreas Ullrich; Nikolaus Studnicka; Johannes Riegl; Simone Orlandini (3DPVT, 2002)

Applicability of single photon detection for laser radar. - Martin Pfennigbauer; Andreas Ullrich (Elektrotech. Informationstechnik, 2007)