Wrong reference in "A clear example of this is the definition of a circle [82] . "

[ToonTalk]

I could find no reference to circles in [82]

Perhaps you meant one of the earliest active essays from 1996 by Mitch Resnick and Brian Silverman:

http://www.rupert.id.au/microworlds/circles/contents.html

It relied upon a browser plugin and/or a Java applet.

[fredhohman]

Hi @ToonTalk,

Thanks for writing in. [82] is the correct citation, as we are referring to a figure about halfway through the article in the "Two models of computation" section. Look for this figure:

Enjoy reading! Fred