Robert, E.M.R.; Schmitz, N.; Boeren, I.; Driessens, T.; Herremans, H.; De Mey, J.; Van de Casteele, E.; Beeckman, H.; Koedam, N. (2011). Successive cambia: A developmental oddity or an adaptive structure? PLoS One 6(1): e16558 + suppl. dx.doi.org/10.1371/journal.pone.0016558, meer
