Interesting paper, thanks. Simula was without a doubt far ahead of its time. Though classes as modules is essentially implemented in Java. Concerning Smalltalk and it's features we now have another very interesting paper by Ingalls: https://dl.acm.org/doi/abs/10.1145/3386335.
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For those interested: I'm working on a Simula 67 implementation, the parser already works: https://github.com/rochus-keller/Simula.