1. Bejarano M. and Thompson M. R. (1999). Subgrade Soil Evaluation for the Design of Airport Flexible Pavements final report COE report No. 8 University of Illinois Urbana-Champaign IL.
2. Ceylan H. Gopalakrishnan K. and Kim S. (2009). "Use of bio-oil for pavement subgrade soil stabilization." Proceedings of 2009 Mid-Continent Transportation Research Symposium (CD-ROM) InTrans Iowa State University Ames IA.
3. Ceylan H. Gopalakrishnan K. and Kim S. (2010). "Soil Stabilizer derived from sustainable energy co-product." Proceedings of 89th Transportation Research Board Annual Meeting (DVD) National Research Council National Academy of Science Washington DC.
4. Gopalakrishnan K. Ceylan H. and Kim S. (2010). Biofuel Co-Product uses for pavement geo-Materials stabilization Institute for Transportation Iowa State University Ames IA.
5. Characterization of NAPTF subgrade soils for mechanistic-based analysis and design of airport flexible pavements