| http://www.w3.org/ns/prov#value | - The norwegian area of Hessdalen is the most important of them [16, 22], where since 1984 visual, magnetometric, radar and radiometric recordings have been carried out, and where an automatic sensing station is operational since 1998, being it equipped with several types of wide-field and zoom CCD cameras and a radar, able to record in real time the apparition of anomalous luminous phenomena.
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