On Hadronic Production of the $B_c$ Meson
  Two of the approaches to the hadronic productions of the double heavy mesons $B_c$ and $B_c^*$ are investigated. Comparison in various aspects on the results obtained by the approaches is made and shown in figures and a table. Some trial understanding of the approaches themselves and the achieved results is presented. The results may be used as some references for discovering the mesons at Tevatron and LHC. 
Chao-Hsi Chang, Yu-Qi Chen, Guo-Ping Han and Hong-Tao Jiang