STACKING FAULTS, TWINS, AND THE STRUCTURAL STABILITY OF VAN DER WAALS SOLIDS J. A. VENABLES, C. A. ENGLISH, K. F. NIEBEL and G. J. TATLOCK J. Phys. Colloques, 35 C7 (1974) C7-113-C7-119 DOI: 10.1051/jphyscol:1974711