Imaging with a quad cell tracker: the advanced imaging tracker Schmutz, L. ; Bowker, J. ; Dillon, R. ; Feinleib, J. ; Landon, S. ; Shao, M. ; Tubbs, S. Abstract Publication: IEEE Journal of Quantum Electronics Pub Date: December 1981 DOI: 10.1109/JQE.1981.1070792 Bibcode: 1981IJQE...17.2512S