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<http://webisa.webdatacommons.org/prov/465301282>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/239029950> .
<http://webisa.webdatacommons.org/239029950>	<http://www.w3.org/ns/prov#value>	"FIGS. 5a and 5 b are a flow chart of a first calibration stage of a compass calibration technique according to the invention;" .
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