Count the different affiliations of the authors of 'Security of 2t-Root Identification and Signatures'.
How many different affiliations do the authors of 'Security of 2t-Root Identification and Signatures' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/eccc/ECCC-TR96-019> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/eccc/ECCC-TR96-019>