  In a recent article Jan Sperling, Syamsundar De, Thomas Nitsche, Johannes
Tiedau, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn discuss the
wave-particle duality using an experiment to demonstrate that "neither the wave
nor the particle description is sufficient to predict the utcomes of
quantum-optical experiments." I would like to draw your attention to two
previous papers that discuss feasible experiments in which a photon does not
seem to behave either as particle or as wave and make some brief considerations
on the topic.
