Count the different affiliations of the authors of 'Simplified Method of Speed Control of a DC Motor through DAS Using MATLAB-Based PID Controller and Study of its Application in a Voltage Control System of a DC Generator'.
How many different affiliations do the authors of 'Simplified Method of Speed Control of a DC Motor through DAS Using MATLAB-Based PID Controller and Study of its Application in a Voltage Control System of a DC Generator' have?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/ijmtie/ChattopadhyayB13> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> ?answer }
<https://dblp.org/rec/journals/ijmtie/ChattopadhyayB13>