Averkov, Gennadiy;  Bey, Christian
Description of polygonal regions by polynomials of bounded degree
In: Monatshefte für Mathematik. - Wien [u.a.] : Springer, Bd. 162.2011, 1, S. 19-27
https://doi.org/10.1007/s00605-010-0224-x

Averkov, Gennadiy;  Henk, Martin
Representing simple d-dimensional polytopes by d polynomials
In: Mathematical programming / A - Berlin: Springer, Bd. 126.2011, 2, S. 203-230
https://doi.org/10.1007/s10107-009-0280-y