Franz Peherstorfer, Robert Steinbauer,
"Note on "Rational compacts and exposed quadratic irrationalities'' by Sergey Khrushchev"
, in Journal of Approximation Theory, Vol. 159, Nummer 2, Seite(n) 290-292, 2009, ISSN: 0021-9045
Original Titel:
Note on "Rational compacts and exposed quadratic irrationalities'' by Sergey Khrushchev