Geodesic
An~approximation modulo~$s_2$ of isometrical operators and cocycle conjugacy of endomorphisms of the~CAR algebra
Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 3, pp. 925-930.

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We investigate the possibility of approximation modulo $s_2$ of isometrical operators in Hilbert space. Further we give the criterion of innerness of quasifree automorphisms of hyperfinfite factors $\mathcal M$ of type $\mathrm{II}_1$ and type $\mathrm{III}_{\lambda }$ generated by the representations of the algebra of canonical anticommutation relations (CAR). The results are used to describe cocycle conjugacy classes of quasifree shifts on hyperfinite factors of $\mathcal M$. 
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     author = {G. G. Amosov},
     title = {An~approximation modulo~$s_2$ of isometrical operators and cocycle conjugacy of endomorphisms of {the~CAR} algebra},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {925--930},
     publisher = {mathdoc},
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     year = {2001},
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G. G. Amosov. An~approximation modulo~$s_2$ of isometrical operators and cocycle conjugacy of endomorphisms of the~CAR algebra. Fundamentalʹnaâ i prikladnaâ matematika, Tome 7 (2001) no. 3, pp. 925-930. http://geodesic.mathdoc.fr/item/FPM_2001_7_3_a20/