In 2004, how many papers did the authors of 'Landmine Feature Extraction and Classification of GPR Data Based on SVM Method' publish?
Count the papers published by the authors of 'Landmine Feature Extraction and Classification of GPR Data Based on SVM Method' in 2004.
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/isnn/ZhangLN04> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#yearOfPublication> '2004' }
<https://dblp.org/rec/conf/isnn/ZhangLN04>