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ž¦³Š‡r Á„¬¦µ›·‡»–. (2548). Á°„µ¦ž¦³„°„µ¦°œÁ¦ºÉ°Šš§¬‘¸ÁºÊ°Š˜o œÁ„¸É¥ª„´¦´ Š¸Â„¤¤µÁž„ئÇže.
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Beretka, J. and Mathew, P.J. (1985). Natural radioactivity of Australian building materials, industrial wastes and
by-products. Health Physics. 48, 87-95.