Assertion: glacier's loss | /r/HasProperty | quantified by three independent techniques
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Source sentences:
text: The mass loss has been quantified by three independent techniques using changes in ice volume (6, 7), time-variable gravity (8), and input versus output fluxes or mass budget method (1, 2, 4, 9⇓–11), for the time period 1992–2016 or 2002–2016.