Abnormal orientation variants and interfaces in ferroelastics and precautions to be taken for the use of group theory (example : rare earth sesquioxides) M. Ben Salem, B. Yangui et C. BoulesteixJ. Phys. France, 48 7 (1987) 1147-1153DOI: https://doi.org/10.1051/jphys:019870048070114700
