Add pyhf use citation from 'Search for Events with Two Displaced Vertices from
Pair-Produced Neutral Long-Lived Particles Decaying to Hadronic Jets in the
Muon Spectrometer of the ATLAS Detector with Full Run 2 Data'.
Add pyhf use citation from 'Search for a dark leptophilic scalar produced in
association with τ+τ− pair in e+e− annihilation at center-of-mass energies near
10.58 GeV'.