Count the different affiliations of the authors of 'Hybrid multi-parametric model predictive control of a nonlinear process approximated with a piecewise affine model'.
How many different affiliations do the authors of 'Hybrid multi-parametric model predictive control of a nonlinear process approximated with a piecewise affine model' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/eucc/PregeljG09> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/conf/eucc/PregeljG09>