Before revision: First introduced in 1954 by MacKenzie L. Keith and Rustum Roy for the oxide perovskites of the chemical formula ABO3, it was later popularized by a compiled handbook written by Olaf Muller and Rustum Roy, published in 1974 that included many more known materials .
After revision: to classify structural prototypesFirst introduced in 1954 by MacKenzie L. Keith and Rustum Roy for the oxide perovskites of the chemical formula ABO3, it was later popularized by a compiled handbook written by Olaf Muller and Rustum Roy, published in 1974 that included many more known materials .