Christopher P. McKay, Josep M. Trigo–rodríguez, P. Ehrenfreund, E. P. Martin, "The distribution of life in the universe", in: Life as we know it, Berlin, Springer, 2006
Christopher P. McKay, Josep M. Trigo–rodríguez, P. Ehrenfreund, E. P. Martin, "The distribution of life in the universe", in: Life as we know it, Berlin, Springer, 2006
