Rapid, low-cost determination of Hg2+, Cu2+, and Fe3+ using a cellulose paper-based sensor and UV–vis method with silver nanoparticles synthesized with S. mammosum oleh Fernanda Pilaquinga, Jeroni Morey, Paulino Duel, Gabriela S. Yánez-Jácome, Esthefanía Chuisaca-Londa, Karen Guzmán, Jazel Caiza, Melanny Tapia, Alexis Debut, Karla Vizuete, María de las Nieves Piña