Geodesic
On the mean rotation in finite deformation
Theoretical and applied mechanics, Volume 24 (1998) no. 1, p. 55 
Jovo Jarić; Stephen Cowin. On the mean rotation in finite deformation. Theoretical and applied mechanics, Volume 24 (1998) no. 1, p. 55 . http://geodesic.mathdoc.fr/item/TAM_1998_24_1_a3/
@article{TAM_1998_24_1_a3,
     author = {Jovo Jari\'c and Stephen Cowin},
     title = {On the mean rotation in finite deformation},
     journal = {Theoretical and applied mechanics},
     pages = {55 },
     year = {1998},
     volume = {24},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1998_24_1_a3/}
}
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See the original article notice from the eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts source

in this paper we define the mean rotation angle for deformable body. Then making use of this definition we show that such a measure of a rotation may be used to define mean rotation in sense of Cauchy and Truesdell and Toupin uniquely for each plane at any point of the Iody without any restriction.