Dugan, P. R., Quigley, D. R., & Atia, V. A. (1991). Processing and utilization of high-suffur coals iv: Proceeding of the 4th international conference on processing and utilization of high-suffur coals, August 26-30, 1991, Idaho Falls, Idaho, U.S.A. Amsterdam: Elsevier Publishing Co..
Παραπομπή Chicago StyleDugan, P. R., D. R. Quigley, and V. A. Atia. Processing and Utilization of High-suffur Coals Iv: Proceeding of the 4th International Conference On Processing and Utilization of High-suffur Coals, August 26-30, 1991, Idaho Falls, Idaho, U.S.A. Amsterdam: Elsevier Publishing Co., 1991.
Παραπομπή MLADugan, P. R., D. R. Quigley, and V. A. Atia. Processing and Utilization of High-suffur Coals Iv: Proceeding of the 4th International Conference On Processing and Utilization of High-suffur Coals, August 26-30, 1991, Idaho Falls, Idaho, U.S.A. Amsterdam: Elsevier Publishing Co., 1991.