Adiabatic calorimetry measurements in the vicinity of the nematic-smectic A-smectic C multicritical point M.A. Anisimov, V.P. Voronov, A.O. Kulkov et F. Kholmurodov J. Phys. France, 46 12 (1985) 2137-2143 DOI: 10.1051/jphys:0198500460120213700