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We describe a catalogue of gamma-ray source candidates, selected using theMinimum Spanning Tree (MST) algorithm on the 9-years Fermi-LAT sky (Pass 8) atenergies higher than 10 GeV. The extragalactic sky at absolute Galacticlatitudes above 20 degrees has been investigated using rather restrictiveselection criteria, resulting in a total sample of 1342 sources. Of these, 249are new detections, not previously associated with gamma-ray catalogues. Alarge fraction of them have interesting counterparts, most likely blazars. Inthis paper the main results on the catalogue selection and search ofcounterparts are reported.

A MST catalogue of gamma-ray source candidates above 10 GeV and at Galactic latitudes higher than 20 degrees