Comment by Rochus

> Kay came to Simula as a reader, turned it into Smalltalk

There is a significant difference between Simula I and Simula 67, and Kay in his 1969 dissertation only referenced the 1966 ACM paper on Simula I. It took many more years until Simula 67 was referenced in a publication by Kay or his team (specifically, "SIMLUA Begin" in Ingalls' 1978 publication about Smalltalk-76). The documented facts (see also Ingalls' 2020 ACM HOPL paper) rather suggest the following relations: Kay - Simula I - Smalltalk-72 and Ingalls - Simula 67 - Smalltalk-76/80