Foraminifera source request

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Chang, L.-H. (1964). 四川江油马角坝中、晚石炭世的(竹蜓)类 - Middle and Upper Carboniferous fusulinids from Jiangyou District, northwestern Szechuan. 古生物学报 - Acta Palaeontologica Sinica. 12(2): 217-235.