Ferreira, Sérgio L C Application of Doehlert designs for optimisation of an on-line preconcentration system for copper determination by flame atomic absorption spectrometry. [electronic resource] - Talanta Nov 2003 - 295-303 p. digital Publication Type: Journal Article ISSN: 1873-3573 Standard No.: 10.1016/S0039-9140(03)00277-7 doi