Mention the count of papers published by the authors of 'Synergistic use of AMSR-E and MODIS Data for Understanding Grassland Land Surface Phenologies' in IEEE International Geoscience and Remote Sensing Symposium.
How many papers did the authors of 'Synergistic use of AMSR-E and MODIS Data for Understanding Grassland Land Surface Phenologies' publish in IGARSS?
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/igarss/DoubkovaH06> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#publishedIn> 'IGARSS' }
<https://dblp.org/rec/conf/igarss/DoubkovaH06>