with Schmidt, S. , 2016, Making sense in the medical system: placebo, biosemiotics, and the pseudomachine, in F. Goli (ed.), Biosemiotic medicine, Dordrecht, Springer, pp. 195-215.
with Tressoldi, P. , Pederzoli, L. , 2016, 'Mental, behavioural and physiological nonlocal correlations within the generalized quantum theory framework', Axiomathes 26 (3), 313-328.
, 2015, Secular spirituality: the next step towards enlightenment, Springer, Dordrecht.
with Schmidt, S. , 2014, Introduction: laying out the field of meditation research, in S. Schmidt & H. Walach (eds.), Meditation, Dordrecht, Springer, pp. 1-6.
, 2014, Towards an epistemology of inner experience, in S. Schmidt & H. Walach (eds.), Meditation, Dordrecht, Springer, pp. 7-22.
with Schmidt, S. (eds) , 2014, Meditation: neuroscientific approaches and philosophical implications, Springer, Dordrecht.
with Hinterberger, T. , Kohls, N. , 2011, Neurophysiological correlates to psychological trait variables in experienced meditative practitioners, in H. Walach, S. Schmidt & W. B. Jonas (eds.), Neuroscience, consciousness and spirituality, Dordrecht, Springer, pp. 129-155.
with Römer, 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.
, 2011, Neuroscience, consciousness, spirituality – questions, problems and potential solutions: an introductory essay, in H. Walach, S. Schmidt & W. B. Jonas (eds.), Neuroscience, consciousness and spirituality, Dordrecht, Springer, pp. 1-21.
with Römer, 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 von Stillfried, N. , 2011, 'Generalised quantum theory—basic idea and general intuition: a background story and overview', Axiomathes 21 (2), 185-209.
with Schmidt, S. , Jonas, W. B. (eds) , 2011, Neuroscience, consciousness and spirituality, Springer, Dordrecht.
with von Stillfried, N. (eds) , 2011a, Axiomathes 21 (2).