Na-O anticorrelation and horizontal branches - IV. Detection of He-rich and He-poor stellar populations in the globular cluster NGC 6218
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R. Claudi | G. Piotto | A. Bragaglia | S. Cassisi | E. Sabbi | F. D’Antona | E. Carretta | G. Catanzaro | G. James | F. Leone | R. Gratton | P. Francois