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* Hillas thinning, Hillias splitting (original reference): [_JK_Hillas-Symposium.pdf](uploads/a178f66e1b5c54b1e3d23b6866f63ebd/_JK_Hillas-Symposium.pdf)
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* Hillas thinning (original reference): ICRC 1981 [_JK_Hillas-Symposium.pdf](uploads/a178f66e1b5c54b1e3d23b6866f63ebd/_JK_Hillas-Symposium.pdf)
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