Experimental study of de Vries properties in antiferroelectric smectic liquid crystals K. L. Sandhya, Yu. P. Panarin, V. P. Panov, J. K. Vij and R. Dabrowski Eur. Phys. J. E, 27 4 (2008) 397-405 Published online: 23 December 2008 DOI: 10.1140/epje/i2008-10409-1