An investigation of copper chlorophyllin solution for low-cost optical devices calibration in chlorophyll measurementBayu Taruna Widjaja Putra, Risky Setiawan Purwoko, Indarto Indarto and Peeyush SoniInt. J. Metrol. Qual. Eng., 10 (2019) 10DOI: https://doi.org/10.1051/ijmqe/2019009
