Molecular models for ferroelectric liquid crystals with conventional and anomalously weak layer contractionM. A. Osipov, M. V. Gorkunov, H. F. Gleeson and S. JaradatEur. Phys. J. E, 26 4 (2008) 395-404DOI: https://doi.org/10.1140/epje/i2008-10339-x