By-product (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "By-product" in English language version.

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books.google.com

Muthu, Subramanian Senthilkannan; Li, Yi (2013). "Manufacturing Processes of Grocery Shopping Bags". Assessment of Environmental Impact by Grocery Shopping Bags: An Eco-Functional Approach. Environmental Issues in Logistics and Manufacturing. Singapore: Springer Science & Business Media. p. 7. ISBN 9789814560207. Retrieved 27 July 2019. Plastic is obtained as a by-product from the oil refining process [...]

Watson, Will (2012). "On Byproducts and Side Products". Org. Process Res. Dev. 16 (12): 1877–1877. doi:10.1021/op300317g.