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Abstract:
Cosmic-ray exotic event, called Centauro, is characterised by
the multiple particle production without (appreciable) production
of gamma-rays (and electrons).
We have several candidate events of Centauro-type by
a series of emulsion chamber experiment
at Mt. Chacaltaya (5,200 m, Bolivia). Recently we found another
candidate event of small multiplicity.
Experimental data of these candidate events are summarized
and a discussion is made on the origin of Centauro events.
