no. 3
Commuting varieties of semisimple Lie algebras and algebraic groups
Compositio Mathematica, Tome 38 (1979) no. 3, pp. 311-327. 
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     author = {Richardson, R. W.},
     title = {Commuting varieties of semisimple {Lie} algebras and algebraic groups},
     journal = {Compositio Mathematica},
     pages = {311--327},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {38},
     number = {3},
     year = {1979},
     mrnumber = {535074},
     zbl = {0409.17006},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1979__38_3_311_0/}
}
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Richardson, R. W. Commuting varieties of semisimple Lie algebras and algebraic groups. Compositio Mathematica, Tome 38 (1979) no. 3, pp. 311-327. http://archive.numdam.org/item/CM_1979__38_3_311_0/

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