no. 2
On the homotopy groups of some equivariant automorphism groups of spheres
Compositio Mathematica, Tome 31 (1975) no. 2, pp. 229-234. 
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     author = {Erle, Dieter},
     title = {On the homotopy groups of some equivariant automorphism groups of spheres},
     journal = {Compositio Mathematica},
     pages = {229--234},
     publisher = {Noordhoff International Publishing},
     volume = {31},
     number = {2},
     year = {1975},
     mrnumber = {391137},
     zbl = {0313.57034},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1975__31_2_229_0/}
}
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Erle, Dieter. On the homotopy groups of some equivariant automorphism groups of spheres. Compositio Mathematica, Tome 31 (1975) no. 2, pp. 229-234. http://archive.numdam.org/item/CM_1975__31_2_229_0/

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