麻烦查一下以下四篇英文文献，谢谢！

【序号】：1
【作者】：Ze-kun Li, Gang Wang*, Quan Shi, Chun-ming Xu, and Jin-sen Gao
【题名】：Retardation Effect of Basic Nitrogen Compounds on Hydrocarbons Catalytic Cracking in Coker Gas Oil and Their Structural Identification
【期刊】：Ind. Eng. Chem. Res.
【年、卷、期、起止页码】：2011, 50 (7), pp 4123–4132
【全文链接】：http://pubs.acs.org/doi/abs/10.1021/ie102117x

【序号】：2
【作者】：Yahe Zhang†, Hui Zhao†, Quan Shi*†, Keng H. Chung‡, Suoqi Zhao†, and Chunming Xu*†
【题名】：Molecular Investigation of Crude Oil Sludge from an Electric Dehydrator
【期刊】：Energy Fuels
【年、卷、期、起止页码】：2011, 25 (7), pp 3116–3124
【全文链接】：http://pubs.acs.org/doi/abs/10.1021/ef200512c

【序号】：3
【作者】：Peng Liu†, Quan Shi*†, Na Pan†, Yahe Zhang†, Keng H. Chung‡, Suoqi Zhao†, and Chunming Xu*†
【题名】：Distribution of Sulfides and Thiophenic Compounds in VGO Subfractions: Characterized by Positive-Ion Electrospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
【期刊】：Energy Fuels
【年、卷、期、起止页码】：2011, 25 (7), pp 3014–3020
【全文链接】：http://pubs.acs.org/doi/abs/10.1021/ef200496k

【序号】：4
【作者】：Xiaochun Zhu†, Quan Shi*†, Yahe Zhang†, Na Pan†, Chunming Xu*†, Keng H. Chung‡, and Suoqi Zhao†
【题名】：Characterization of Nitrogen Compounds in Coker Heavy Gas Oil and Its Subfractions by Liquid Chromatographic Separation Followed by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
【期刊】：Energy Fuels
【年、卷、期、起止页码】：2011, 25 (1), pp 281–287
【全文链接】：http://pubs.acs.org/doi/abs/10.1021/ef101328n