How many different affiliations do the authors of 'Analysing the optical network unit power consumption in the 10 GB-capable passive optical network systems' have?
Count the different affiliations of the authors of 'Analysing the optical network unit power consumption in the 10 GB-capable passive optical network systems'.
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/iet-net/SarigiannidisLP16> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/iet-net/SarigiannidisLP16>