Landau–Devonshire theory
                        
                        
                            Scott, J. F., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2013). 
                                         
                                            Vol. D,
                                            
                                                            
                                                                Section 3.1.5.2.1,
                                                                    
                                                            
                                                                pp. 381-382
                                                                        
                                            
                                        
                        
                        
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        Van der Waals, J. D.  (1873). PhD thesis, University of Leiden. Google Scholar ...
                            
                                
     [
more
                                    results from section 3.1.5 in volume D]
                            
                            
                            
                            
                    
                        
                            Structural phase transitions
                        
                        
                            Tolédano, J.-C., 
Janovec, V., 
Kopský, V., 
Scott, J. F. and 
Boček, P., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2013). 
                                         
                                            Vol. D,
                                            
                                                            
                                                                        ch. 3.1,
                                                            
                                                            
                                                                pp. 358-396
                                                                        
                                            
                                        
                        
                        
[ doi:10.1107/97809553602060000915 ]
                        
                            
                            
                            
                            
                    
                        
                            Glossary
                        
                        
                            Tolédano, J.-C., 
Janovec, V., 
Kopský, V., 
Scott, J. F. and 
Boček, P., 
                        
                        
                                        
                                            International Tables for Crystallography
                                         (2013). 
                                         
                                            Vol. D,
                                            
                                                            
                                                                Section 3.1.7,
                                                                    
                                                            
                                                                pp. 394-394
                                                                        
                                            
                                        
                        
                        
[ doi:10.1107/97809553602060000915 ]
                        mode and coupled modes in the paraelectric and ferroelectric phases of KH  2  PO  4  . Phys. Rev. B,   12, 2741–2746. Google Scholar 
 
        Zhang, M.-S.,  Chen, Q.,  Sun, D.,  Ji, R.-F.,  Qin, Z.-K.,  Yu, Z.  &  
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F.  (1988 ...