Assertion: erbium | /r/HasProperty | submitted to systematic investigations
Facets:
value: over the next few decades
type: TEMPORAL
Source sentences:
text: Submitted to systematic investigations by a dream team of chemists, geologists and spectroscopists in Geneva over the next few decades, Mosander's erbium and terbium proved to be mixtures of no fewer than seven elements: not only erbium and terbium, but also ytterbium, scandium, thulium, holmium and gadolinium.