| PhotoMetrix: an application for univariate calibration and principal components analysis using colorimetry on mobile devices GA Helfer, VS Magnus, FC Böck, A Teichmann, MF Ferrão, AB Costa Journal of the Brazilian Chemical Society 28 (2), 328-335, 2017 | 127 | 2017 |
| PhotoMetrix and colorimetric image analysis using smartphones FC Böck, GA Helfer, AB da Costa, MB Dessuy, MF Ferrão Journal of Chemometrics 34 (12), e3251, 2020 | 76 | 2020 |
| Chemostat, um software gratuito para análise exploratória de dados multivariados GA Helfer, F Bock, L Marder, JC Furtado, AB Costa, MF Ferrão Química Nova 38 (4), 575-579, 2015 | 57 | 2015 |
| Point-of-use electroanalytical platform based on homemade potentiostat and smartphone for multivariate data processing GF Giordano, MBR Vicentini, RC Murer, F Augusto, MF Ferrão, GA Helfer, ... Electrochimica Acta 219, 170-177, 2016 | 56 | 2016 |
| IndoorPlant: A model for intelligent services in indoor agriculture based on context histories BG Martini, GA Helfer, JLV Barbosa, RC Espinosa Modolo, MR da Silva, ... Sensors 21 (5), 1631, 2021 | 53 | 2021 |
| A computational model for soil fertility prediction in ubiquitous agriculture GA Helfer, JLV Barbosa, R dos Santos, AB da Costa Computers and Electronics in Agriculture 175, 105602, 2020 | 53 | 2020 |
| Rapid determination of ethanol in sugarcane spirit using partial least squares regression embedded in smartphone FC Böck, GA Helfer, AB da Costa, MB Dessuy, MF Ferrão Food Analytical Methods 11, 1951-1957, 2018 | 43 | 2018 |
| Fast methodology for identification of olive oil adulterated with a mix of different vegetable oils PF Filoda, LF Fetter, F Fornasier, RCS Schneider, GA Helfer, B Tischer, ... Food Analytical Methods 12 (1), 293-304, 2019 | 42 | 2019 |
| A new tool for interpretation of thermal stability of raw milk by means of the alizarol test using a PLS model on a mobile device GA Helfer, B Tischer, PF Filoda, AB Parckert, RB dos Santos, ... Food Analytical Methods 11, 2022-2028, 2018 | 35 | 2018 |
| Chemostat: exploratory multivariate data analysis software GA Helfer, F Bock, L Marder, JC Furtado, AB Costa, MF Ferrão Química nova 38, 575-579, 2015 | 29 | 2015 |
| PhotoMetrix UVC: A new smartphone-based device for digital image colorimetric analysis using PLS regression AB Costa, GA Helfer, JLV Barbosa, ID Teixeira, RO Santos, RB Santos, ... Journal of the Brazilian Chemical Society 32, 675-683, 2021 | 27 | 2021 |
| Multispectral cameras and machine learning integrated into portable devices as clay prediction technology GA Helfer, JLV Barbosa, D Alves, AB da Costa, M Beko, VRQ Leithardt Journal of Sensor and Actuator Networks 10 (3), 40, 2021 | 26 | 2021 |
| Low cost method for copper determination in sugarcane spirits using Photometrix UVC® embedded in smartphone FC Böck, GA Helfer, AB da Costa, MB Dessuy, MF Ferrão Food Chemistry 367, 130669, 2022 | 24 | 2022 |
| Principal component analysis of commercial tannin extracts using digital images on mobile devices FS Grasel, MF Ferrão, GA Helfer, AB Costa Journal of the brazilian chemical society 27 (12), 2372-2377, 2016 | 24 | 2016 |
| Pulicação de métodos de análise multivariada no controle qualitativo de essências alimentícias empregando espectroscopia no infravermelho médio GA Helfer, MF Ferrão, CV Ferreira, N Hermes Food Science and Technology 26, 779-786, 2006 | 20 | 2006 |
| Point-of-use determination of fluoride and phosphorus in water through a smartphone using the PhotoMetrix® App C Pappis, M Librelotto, L Baumann, AB Parckert, RO Santos, ID Teixeira, ... Brazilian Journal of Analytical Chemistry 6 (25), 1-9, 2019 | 16 | 2019 |
| A green and high throughput method for salt determination in crude oil using digital image-based colorimetry in a portable device AP Holkem, M Voss, SK Schlesner, GA Helfer, AB Costa, JS Barin, ... Fuel 289, 119941, 2021 | 15 | 2021 |
| Total dissolved iron and hydrogen peroxide determination using the PhotoMetrixPRO application: A portable colorimetric analysis tool for controlling important conditions in the … EC Lumbaque, BA da Silva, FC Böck, GA Helfer, MF Ferrão, C Sirtori Journal of hazardous materials 378, 120740, 2019 | 14 | 2019 |
| Open source, low-cost device for thermometric titration with non-contact temperature measurement KO Alessio, B Tischer, M Voss, ID Teixeira, BM Brendler, FA Duarte, ... Talanta 216, 120975, 2020 | 13 | 2020 |
| Blue ballpoint pen inks differentiation using multivariate image analysis of digital images captured with PhotoMetrix PRO® RP Gorziza, CMB de Carvalho, M González, RS Ortiz, GA Helfer, ... Brazilian Journal of Forensic Sciences, Medical Law and Bioethics 9 (3), 331-355, 2020 | 13 | 2020 |