Stufenkonvexität in der Geometrie KÁROLY BEZDEK; István Joó — 1985 Beiträge zur Algebra und Geometrie = Contributions to algebra and geometry
On the sequence of numbers of the form ε ₀ + ε ₁ q + . . . + ε n q n , ε i ∈ 0 , 1 Paul Erdős; István Joó; Vilmos Komornik — 1998 Acta Arithmetica