Alfie Abdul-Rahman, Min Chen, David H. Laidlaw, and Brian Fisher.
 <b>Supporting Diverse Research Methods for Observing Huge
  Variable Space in Empirical Studies for Visualization</b>.
 In <em>Visualization Psychology</em>, pages 109--136. Springer, 2023.
  <a href="http://vis.cs.brown.edu/docs/pdf/g/Abdul-2023-SDR.pdf.html">(pdf)</a>
  <a href="http://vis.cs.brown.edu/results/bibtex/Abdul-2023-SDR.bib">(bibtex:
  Abdul-2023-SDR)</a>.