Overall, not a bad introductory article. However, the lack of a reference to Fowler's seminal book on refactoring (nor to any other work on refactoring nor any...
Yes. There should also be a reference, IMHO, to www.refactoring.com as well. Not referencing existing work, particularly in spectacularly obvious cases like...
There seems to be a mention of "Fowler, p 60", but the reference itself is missing. Also, a mention to the "Design Patterns" (Gamma et all, 1994) work. Maybe...