SPARQL-to-SQL on Internet of Things Databases and Streams
A paper by Eugene Siow, Thanassis Tiropanis and Wendy Hall describing an optimisation to a data storage and query technique which more than doubles performance.
Articles about SPARQL
The Design and Implementation of Minimal RDFS Backward Reasoning in 4store
Research paper by Manuel Salvadores, Gianluca Correndo, Steve Harris, Nick Gibbins, and Nigel Shadbolt
Consuming multiple linked data sources: Challenges and Experiences
Research paper discussing the challenges of using multiple sources of Linked Data by Ian C. Millard, Hugh Glaser, Manuel Salvadores and Nigel Shadbolt
SPARQL Query Rewriting for Implementing Data Integration over Linked Data
Research paper presenting an algorithm for RDF data mediation by Gianluca Correndo, Manuel Salvadores, Ian Millard, Hugh Glaser and Nigel Shadbolt