1. Ministry of Land, Infrastructure, and Transport (2016), 3rd National Rail Network Construction Plan (2016-2025), MLIT, Korea. (In Korea).
2. Korea Railway Research Instiute (2016) Development of Asphalt Roadbed and Track System Suited to Speed Up, Korea Railway Research Instiute, Uiwang city, Korea.
3. European Asphalt Pavement Association (EAPA)(2014), Asphalt in Railway Tracks, Position Paper, European Asphalt Pavement Association, Brussels, Belgium, 2014, pp. 4–11.
4. C. Esveld, Modern Railway Track, second ed., MRT-productions, NL-5300 AH Zaltbommel, Netherlands (2001), pp. 245–246.
5. Track Compendium, Formation – Permanent way, Maintenance, Economics;Lichtberger,2005