Who writes the headlines? This is hardly "at a glance" this is a (fantastic) 58.5 page long descriptive inventory and technical framing of some 30 years of evolution of PVT (and a page of other abbreviations) and 716 endnotes… They have published a free book on this important subject. Very cool. Not a glance though. Highly recommended – I’ve been reading in this area for years and there is plenty that they helped uncover.