Investigation of the first-order metamagnetic transitions and the colossal magnetocaloric effect using a Landau expansion applied to MnAs compoundA. Magnus G. Carvalho, A. A. Coelho, S. Gama, F. C.G. Gandra, P. J. von Ranke and N. A. de OliveiraEur. Phys. J. B, 68 1 (2009) 67-72DOI: https://doi.org/10.1140/epjb/e2009-00083-9