1. ‘Standard specification for corrugated polyethylene pipes, 300- to 1500-mm diameter’, AASHTO Designation: M294.
2. Y. G. Hsuan and T. J. McGrath: `HDPE pipe: recommended material specifications and design requirements', NCHRP Report 429, Transportation Research Board, National Research Council, Washington, DC, USA, 1999.
3. Structure and crack growth in gas pipes of medium-density and high-density polyethylene