Study of B_s Mixing at the D-Zero Detector at Fermilab Using the Semi-leptonic Decay B_s -> D_s mu nu X, thesis or dissertation, June 1, 2008; (https://digital.library.unt.edu/ark:/67531/metadc897463/m1/1/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .