FIRST OBSERVATION OF THE PRINCIPAL SHEETS OF THE FERMI SURFACE OF COBALT VIA THE DE HAAS-VAN ALPHEN EFFECT A. Marshall, D. D. Pigram et G. G. Lonzarich J. Phys. Colloques, 49 C8 (1988) C8-55-C8-56 DOI: 10.1051/jphyscol:1988814