This publication provides substantial insight into his extensive artistic work over the last 40 years. (artbook.com)
The research methods of the social sciences are quite capable of providing very substantial insight, if not definitive answers, to this question. (religion-online.org)
An examination of 315 - day (1/1/2013 -11 / 11/2013) departures from average for several different atmospheric variables gives substantial insight into the proximate cause of California's extreme dry spell. (weatherwest.com)