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<http://webisa.webdatacommons.org/387482747>	<http://www.w3.org/ns/prov#value>	"He considered factors including their frequency range, the acceleration of their pulses, and whether or not they could be associated with supernova remnants." .
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<http://webisa.webdatacommons.org/387482747>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<symmetrymagazine.org> .