@article{2010-protovis-design,
 title = {Declarative Language Design for Interactive Visualization},
 author = {Jeffrey Heer AND Michael Bostock},
 journal = {IEEE Trans. Visualization \& Comp. Graphics (Proc. InfoVis)},
 year = {2010},
 url = {http://idl.cs.washington.edu/papers/protovis-design},
}