with Filk, T. , 2011, 'Generalized quantum theory: overview and latest developments', Axiomathes 21 (2), 211-220.
with Walach, H. , 2011, Complementarity of phenomenal and physiological observables: a primer on generalised quantum theory and its scope for neuroscience and consciousness studies, in H. Walach, S. Schmidt & W. B. Jonas (eds.), Neuroscience, consciousness and spirituality, Dordrecht, Springer, pp. 97-107.
with Walach, H. , 2011, Generalized entanglement – a nonreductive option for a phenomenologically dualist and ontologically monist view of consciousness, in H. Walach, S. Schmidt & W. B. Jonas (eds.), Neuroscience, consciousness and spirituality, Dordrecht, Springer, pp. 81-95.
with Atmanspacher, H. , Filk, T. , 2009a, Complementarity in bistable perception, in H. Atmanspacher & H. Primas (eds.), Recasting reality, Dordrecht, Springer, pp. 135-150.