A novel strategy for preparing calibration standards for laser-induced breakdown spectroscopy using beeswax as a substrate: A case study with cosmetic and lubricant oil samples - Joca, Jhonny Frank Sousa; Papai, Rodrigo; Nunes, Lidiane Cristina; Luz, Maciel Santos; Krug, Francisco José; Gaubeur, Ivanise (Spectrochimica Acta Part B: Atomic Spectroscopy, 2022)