The maximum power efficiency 1-√τ: Research, education, and bibliometric relevance A. Calvo Hernández, J.M.M. Roco, A. Medina, S. Velasco and L. Guzmán-Vargas Eur. Phys. J. Special Topics, 224 5 (2015) 809-823 Published online: 17 July 2015 DOI: 10.1140/epjst/e2015-02429-4