Ages of very large impact basins on Mars: Implications for the late heavy bombardment in the inner solar system

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Large impact crater histories of Mars: The effect of different model crater age techniques (2013, methodology): “Frey (2008) also used large QCD superposed ages, while Werner (2008) and Fassett and Head (2011) used the isochron method, the former using Neukum-based isochrons and the latter using both systems.”
Rapid decrease in Martian crustal magnetization in the Noachian era: Implications for the dynamo and climate of early Mars (2008, methodology): “White and yellow circles represent QCDs and non-QCD CTAs respectively [ Frey, 2008 ].”
Sequence and timing of conditions on early Mars (2011, background): “More recently, Frey (2008) and Lillis et al. (2008a) suggested that the combined population of possible QCDs and CTAs may provide the best data for considering the age of the largest basins (using features of 300 km and more in diameter).”
Juvenile Chemical Sediments and the Long Term Persistence of Water at the Surface of Mars (2009, background): “During late bombardment, impacts recorded by giant craters would likely have sterilized the planetary surface (Sleep et al., 1989), with one of the last very large impacts, recorded by the ~1350 km Isidis Basin, forming at ~3.8-3.9 Ga (Frey, 2008).”