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KUSAKA, Katsuhiro; OHMASA, Masaaki; HAGIYA, Kenji; IISHI, Kazuaki; HAGA, Nobuhiko . (1998). On variety of the Ca coordination in the incommensurate structure of synthetic iron-bearing akermanite, Ca2(Mg0.55,Fe0.45)Si2O7.. Mineralogical Journal, 20(2), 47–58. doi:10.2465/minerj.20.47 
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