On the valence fluctuation phenomena in SmS compounds F. Brouers, K.H. Bennemann, O.L.T. de Menezes, A. Troper et A.A. Gomes J. Phys. Colloques, 40 C5 (1979) C5-352-C5-353 DOI: 10.1051/jphyscol:19795123
