Brauner, A. E., D. T. Kurjiaka, A. Ibragimov, and A. L. Baldwin. “Impact of Cage Size and Enrichment (Tube and Shelf) on Heart Rate Variability in Rats”. Scandinavian Journal of Laboratory Animal Science, vol. 37, no. 3, Dec. 2010, pp. 185-01, doi:10.23675/sjlas.v37i3.215.