Journal Pre-proof Nonlinear unit root and nonlinear causality in natural gas - economic growth nexus: Evidence from Nigeria Mukhtar Danladi Galadima, Abubakar Wambai Aminu PII: S0360-5442(19)32110-3 DOI: https://doi.org/10.1016/j.energy.2019.116415 Reference: EGY 116415 To appear in: Energy Received Date: 2 April 2019 Revised Date: 18 October 2019 Accepted Date: 21 October 2019 Please cite this article as: Galadima MD, Aminu AW, Nonlinear unit root and nonlinear causality in natural gas - economic growth nexus: Evidence from Nigeria, Energy (2019), doi: https:// doi.org/10.1016/j.energy.2019.116415. This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier Ltd.