Centre For Local Research into Public Space (CELOS)
https://www.celos.ca/wiki/wiki.php?n=CityParks.PlaygroundRiskInvention
reference documents: https://www.celos.ca/wiki/wiki.php?n=CityParks.PlaygroundReferenceDocuments
Important --contains more links and goes up to 2018 (includes correspondence) https://www.celos.ca/wiki/wiki.php?n=PlaygroundNotebooks.PlaygroundInjuriesFrontPage