Yokoyama, T., Dharma, A. and Hehanussa, P. (1989). Radiometric ages and paleomagnetism of the Sigura-Gura Formation, upper part of the 'Toba Tuffs' in Sumatra, Indonesia. Palaeogeography Palaeoclimatology Palaeoecology 72: 161-175. doi: 10.1016/0031-0182(89)90140-5. |
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