Biletsky, V., Molchanov, P., Sokur, M., Gayko, G., Savyk, V., Orlovskyy, V., Liakh, M., Yatsyshyn, T. and Fursa, R. (2017) “Research into the process of preparation of Ukrainian coal by the oil aggregation method”, Eastern-European Journal of Enterprise Technologies, 3(5 (87), pp. 45–53. doi: 10.15587/1729-4061.2017.104123.