To cite ei.Datasets in publications use:

Pavía JM (forthcoming). “ei.Datasets: Real datasets for assessing ecological inference algorithms.” Social Science Computer Review.

Corresponding BibTeX entry:

  @Article{,
    title = {ei.Datasets: Real datasets for assessing ecological
      inference algorithms.},
    author = {Jose M. Pavía},
    journal = {Social Science Computer Review},
    year = {forthcoming},
  }