Weatherill, K., Pritchard, J., Abel, R., Bason, M., Mohapatra, A., & Adams, C. (2008). Electromagnetically induced transparency of an interacting cold Rydberg ensemble. Journal of Physics B: Atomic, Molecular and Optical Physics, 41(20), Article 201002. https://doi.org/10.1088/0953-4075/41/20/201002