Darmawan, Didiet, Mohammad Isa Irawan, and Arie Dipareza Syafei. 2017. “Data Driven Analysis Using Fuzzy Time Series for Air Quality Management in Surabaya”. Sustinere: Journal of Environment and Sustainability 1 (2):131-43. https://doi.org/10.22515/sustinere.jes.v1i2.13.