Evaluation of calibration approaches for quantitative analysis of sludge by laser induced breakdown spectrometry - Thiengo, Fernanda Ferreira; Elias, Aline de Carvalho; Luz, Maciel Santos; Intima, Danielle Polidório; Gaubeur, Ivanise; Naozuka, Juliana; Rocha, Fabio Rodrigo Piovezani; Nomura, Cassiana Seimi (Journal of Analytical Atomic Spectrometry, 2023)