IRREGULARITIES IN THE YRAST LINE OF 156Er T. Byrski, F.A. Beck, C. Gehringer, J.C. Merdinger, Y. Schutz et J.P. Vivien. J. Phys. Colloques, 41 C10 (1980) C10-98-C10-101 DOI: 10.1051/jphyscol:19801010