LOCAL TRICRITICAL BEHAVIOUR IN 3He - 4He MIXTURES FILMS J.P. Laheurte, J.P. Romagnan, A. Gilabert and J.C. Noiray J. Phys. Colloques, 39 C6 (1978) C6-349-C6-350 DOI: 10.1051/jphyscol:19786155