Georgios M. Tourlakis Sotirios Alexandros T. Adamopoulos Irini K. Gavra Alexandros A. Milpanis Liveria F. Tsagri Aikaterini Sofia G. Pachygianni Stylianos S. Chatzikokolis Athanassios A. Tsekouras, Sign flipping of spontaneous polarization in vapour-deposited films of small polar organic molecules, Physical Chemistry Chemical Physics (PCCP), (23), 14352--14362, 2021, Royal Society of Chemistry (RSC), 1463-9076, 1463-9084