I've seen those on Peugeot's, Schwinn's, and Raleigh's. The LBS had the tool - it was a big splined thingie. They could order me one, but it was something like $39

I've only ever had to have 3 removed to replace spokes, so I never bough the tool - they did two for free, and charged me $5 for the other. It depends on when I go into the store and who helps me. When I worked close by the store I used to go in a lot for odd bits, and drop 12 packs of beer on the mechanics every once in a while. It's been a while but some still remember me.