The k-essence scalar field in the context of Supernova Ia observationsAbhijit Bandyopadhyay, Debashis Gangopadhyay and Arka MoulikEur. Phys. J. C, 72 3 (2012) 1943DOI: https://doi.org/10.1140/epjc/s10052-012-1943-z