De Bie, Hendrik
Holíková, Marie
Somberg, Petr
Funding for this research was provided by:
Fund for Scientific Research-Flanders (FWO-V) (G.0116.13N)
Faculty of Mathematics and Physics (Charles University) (SVV-2015-260227)
Grantová Agentura České Republiky (CZ) (GA CR P201/12/G028)