De Broglie's initial conception of De Broglie waves -- Wave-particle duality of light: a current perspective -- Wave-particle dualism in matter wave interferometry -- Neutron wave optics studied with ultracold neutrons -- "Gespensterfelder" -- On the possibility of realising a low intensity interference experiment with a determination of the particle trajectory -- From ghost to real waves: a proposed solution to the wave-particle dilemma -- Permanence of the corpuscular appearance and non linearity of the wave equation -- Could solitons be adiabatic invariants attached to certain non linear equations? -- of the chronon in the theory of electron and the wave-particle duality -- The wave-particle duality as an interplay between order and chaos -- Structures in semiclassical spectra: a question of scale -- Ray optics for diffraction: a useful paradox in a path integral context -- Atomic collision experiments at the border line between classical and quantum mechanics -- On the superposition principle and its physics content -- The probabilistic roots of the quantum mechanical paradoxes -- Causality and symmetry -- A critical analysis of the quantum theory of measurement -- Quantum interference of probabilities and hidden variable theories -- Experimental tests of Bell's inequalities -- Tests of the non separability of the $$ {{\rm{K}}^{\rm{0}}}{{\rm{\bar K}}^{\rm{0}}} $$ system -- A new approach to testing the separability in microphysics: Rapisarda's experiment -- On the possibility of extending the tests of quantum mechanical correlations -- How do we have to change quantum mechanics in order to describe separated systems? -- On the four-dimensional character of micro-physical phenomena -- Dynamics of the reduction of the statevector -- CPT revisted: a manifestly covariant presentation -- Wave-particle duality in a quark model -- Destruction of coherence in nondemolition monitoring: quantum "watchdog effect" in gravity wave detectors -- Nonlocal hidden variables and nonlocal gauge theories -- A finite particle number approach to physics.