SYNTHESIS AND LIQUID CRYSTALLINE PROPERTIES OF 4,4'-DISUBSTITUTED BIPHENYLS D. DEMUS, L. RICHTER, C.-E. RÜRUP, H. SACKMANN and H. SCHUBERT J. Phys. Colloques, 36 C1 (1975) C1-349-C1-354 DOI: 10.1051/jphyscol:1975158