First evidence of multiple populations along the AGB from Strömgren photometryPieter Gruyters, Luca Casagrande, Antonino P. Milone, Simon T. Hodgkin, Aldo Serenelli and Sofia FeltzingA&A, 603 (2017) A37DOI: https://doi.org/10.1051/0004-6361/201630341
