1. Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis;ASTM E1382-97,2015
2. Standard Guide for Preparation of Metallographic Specimens;ASTM E3,2015
3. Standard Test Methods for Tension Testing of Metallic Materials;ASTM E8/E8M-13,2013
4. Niobium in rail steel;Boer,2001
5. Railway Applications. Track. Flash Butt Welding of Rails. New R220, R260, R260Mn and R350HT Grade Rails in a Fixed Plant;BS EN 14587-1,2005