OECD Companion to the Inventory of Support Measures for Fossil Fuels 2018. Paris : OECD, 2018. 52 s. Available on Internet: <https://www.oecd-ilibrary.org/energy/oecd-companion-to-the-inventory-of-support-measures-for-fossil-fuels-2018_9789264286061-en> ISBN 978-92-64-28603-0.