Geodesic
A Decomposition of Orthogonal Transformations
Canadian mathematical bulletin, Tome 7 (1964) no. 3, pp. 379-383

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The purpose of the present note is to give a partial answer to a question raised by Professor Coxeter, namely, if an orthogonal transformation is expressed as a product of orthogonal involutions, how many involutions do we need? Our answer is partial because we are going to consider only non-degenerate symmetric bilinear forms of index 0 and fields of characteristic ≠2. Under these conditions we prove that any orthogonal transformation is the product of at most two orthogonal involutions, which implies that we can write any orthogonal transformation as the product of two involutions. 
Wonenburger, María J. A Decomposition of Orthogonal Transformations. Canadian mathematical bulletin, Tome 7 (1964) no. 3, pp. 379-383. doi: 10.4153/CMB-1964-036-1
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     title = {A {Decomposition} of {Orthogonal} {Transformations}},
     journal = {Canadian mathematical bulletin},
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     year = {1964},
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     number = {3},
     doi = {10.4153/CMB-1964-036-1},
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