Comment on F.J.Ernst, V.S.Manko and E.Ruiz "On interrelations between
Sibgatullin's and Alekseev's approaches to the construction of exact
solutions of the Einstein-Maxwell equations"
(J.Phys.:Conf.Ser.229(2010)012050; arXiv:1006.5118)
Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology