. "Double_beta_decay" . "\u03B2-\u03B2-" . . . "Heidelberg-Moscow controversy" . "double \u03B2+ decay" . "\u03B2⁺\u03B2⁺" . . "double beta decay" . "\u2192" . "Double beta decay" . "double \u03B2-decay" . . "double beta minus decay" . . "neutrinoless double-beta decay" . . "double beta" . "neutrinoless double beta decay" . "Double beta decay" . "Double beta decay#Higher order simultaneous beta decay" . . "neutrinoless double-beta (0\u03BD\u03B2\u03B2) decay" . "Neutrinoless double beta decay" . "double \u03B2⁺ decay" . "Several experiments" . . "double beta-decay" . "double electron capture" . "double \u03B2^\u2212 decay" .