@book{Hajja:2013,
  editor    = "M. Hajja and P. Bullen and J. Matkowski and E. Neuman and S. Simic",
  title     = "International Journal of Mathematics and Mathematical Sciences : Means and their inequalities, ISSN: 0161-1712",
  publisher = "Hindawi Publishing Corporation",
  address   = "-",
  year      = "2013",
}