centrosymmetric

“In this monograph we introduced also the concepts of the structure invariants and seminvariants, special linear combinations of the phases, and used them to devise recipes for origin specification in all the centrosymmetric space groups.”

Herbert A. Hauptman - Autobiography

“The extension to the non-centrosymmetric space groups was made some years later.”

Herbert A. Hauptman - Autobiography

“The initial applications of the procedure for structure determination for centrosymmetric crystals involving probability measures and formulas derived from the joint probability distribution were performed in the middle 1950's in collaboration with colleagues at the U.S.”

Jerome Karle - Autobiography

“During the 1960's, there was an intensive program in my laboratory to develop a procedure for crystal structure determination of broad applicability that would encompass noncentrosymmetric as well as centrosymmetric crystals.”

Jerome Karle - Autobiography