PHASE DIAGRAMS OF CHOLESTERICS IN APPLIED FIELDS : THE TWO-DIMENSIONAL HEXAGONAL PHASE R. M. Hornreich, M. Kugler et S. ShtrikmanJ. Phys. Colloques, 46 C3 (1985) C3-47-C3-60DOI: https://doi.org/10.1051/jphyscol:1985305