An Old Universe in K-Essence Cosmology Yang, Rong-Jia ; Zhang, Shuang Nan ; Chen, Bohai ; Qi, Jing-Zhao Abstract Publication: ISRN Astronomy and Astrophysics Pub Date: 2011 DOI: 10.5402/2011/523617 Bibcode: 2011ISRAA2011E..18Y