| 2018       Intoduction to matrix convex sets and free spectrahedra |
| 2017       with M. Schweighofer : |
|                 On the exactness of Lasserre relaxations and pure states over real closed fields |
| 2017       with M. Schweighofer : |
|                 On the exactness of Lasserre relaxations for compact convex basic closed
semialgebraic sets |
| 2016       A new proof for the existence of degree bounds for Putinar's Positivstellensatz |