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Gun, R. B., Budnik, M. A., Pazhitnova, N. P., Khabkina, O. D., & Golodnaya, T. S. (1973). Plastic asphalts produced from residua of West Siberian crudes. Chemistry and Technology of Fuels and Oils, 9(5), 357–360. doi:10.1007/bf00729145 
10.1007/bf00729145