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In this paper we show an application of the Minimum Spanning Tree (MST)clustering method to the high-energy gamma-ray sky observed at energies higherthan 10 GeV in 6.3 years by the Fermi-Large Area Telescope. We report thedetection of 19 new high-energy gamma-ray clusters with good selectionparameters whose centroid coordinates were found matching the positions ofknown BL Lac objects in the 5th Edition of the Roma-BZCAT catalogue. A briefsummary of the properties of these sources is presented.

astrophysics and space science

Application of the MST clustering to the high energy gamma-ray sky. I -  New possible detection of high-energy gamma-ray emission associated with BL  Lac objects