Another example showing that Loopstra and van Laar (and Breed) recognized Rietveld as the main author as soon as 1968 in
Physics Letters 26A(11) 1968, 526. "The final proof that preferred orientation effects could in this way be removed from the results, was afforded by the excellent agreement between the observed room-temperature data and those computed by means of the least-squares method described by Rietveld [7]. " 7. H,M.Rietveld, Acta Cryst. 22 (1967) 151. The Rietveld software was functionng as soon as 1966. Best, Armel
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