Margaria, G., Riccomagno, E., Chappell, M.J. and Wynn, H.P. (2001) ‘Differential algebra methods for the study of the structural identifiability of rational functions of state-space models in the biosciences’, Mathematical Biosciences, 174, 1-26. DOI: 10.1016/S0025-55640100079-7.