How many different affiliations do the authors of 'Approximation and complexity of functions on the integers' have?
Count the different affiliations of the authors of 'Approximation and complexity of functions on the integers'.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/isci/Tsichritzis71> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/isci/Tsichritzis71>