Parallel EELS elemental mapping in scanning transmission electron microscopy: use of the difference methods Gérard Balossier, Xavier Thomas, Jean Michel, Denis Wagner, Pierre Bonhomme, Edith Puchelle, Dominique Ploton, Annie Bonhomme and Jean Michel Pinon Microsc. Microanal. Microstruct., 2 5 (1991) 531-546 DOI: 10.1051/mmm:0199100205053100