[1]
Aceto, L., Fokkink, W.J., Glabbeek, R.J. van and Ingólfsdóttir, A. 2003. Nested Semantics over Finite Trees are Equationally Hard. BRICS Report Series. 10, 27 (Aug. 2003). DOI:https://doi.org/10.7146/brics.v10i27.21795.