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A review of the main results on the collective type expansion of thecompressed and hot fireball formed in heavy ion collisions and some remarks tobe considered when comparing multiplicity wise phenomena taking place in A-A,p-A and pp collisions, are followed by a discussion of the experimental resultswhich seem to evidence collective type phenomena in pp collisions at $\sqrt{s}$= 7 TeV at high charged particle multiplicity. Correlations among the kineticfreeze-out temperature, the average transverse expansion velocity and itsprofile, as a function of centrality and multiplicity, extracted from the fitsof experimental transverse momentum spectra with an expression inspired byhydrodynamical models, estimates on Bjorken energy densities and perspectivesin selecting soft and close to azimuthal isotropic events in pp collisions arepresented.

Recent results and open questions on collective type phenomena from A-A to pp collisions