1 Correction to: Mediterr. J. Math. (2020) 17:149 https://doi.org/10.1007/s00009-020-01588-2

In the original publication, the surname of the Author “L. G. González Ricardo” was inadvertently swapped. The correct Author group has been provided below:

L. G. González Ricardo, G. López Lagomasino and S. Medina Peralta