Charpentier, A. D., Bergerson, J. A. and MacLean, H. L. (2009). "Understanding the canadian oil sands industry`s greenhouse gas emissions." Environmental Research Letters, Vol. 4, No. 1, pp. 1-11.

Elkasabgy, M. and El Naggar, M. H. (2014). "Axial compressive response of large-capacity helical and driven steel piles in cohesive soil." Canadian Geotechnical Journal, Vol. 52, No. 2, pp. 224-243.

Elsherbiny, Z. H. and El Nagger, M. H. (2013). "Axial compressive capacity of helical piles from field tests and numerical study." Canadian Geotechnical Journal, Vol. 50, No. 12, pp. 1191-1203.

Kulhawy, F. H. (2004). "On the axial behaviour of drilled foundations." American Society for Civil Engineering, GeoSupport Conference 2004: Drilled Shafts, Micropiling, Deep Mixing, Remedial Methods, and Specialty Foundation System, Florida, pp. 34-51.

Kurian, N. P. and Shah, S. J. (2009). "Studies on the behaviour of screw piles by the finite element method." Canadian Geotechnical Journal, Vol. 46, No. 6, pp. 627-638.

Lee, D., Na, K., Lee, W., Kim, H.-N. and Choi, H. (2014). "Applicability of bi-directional load test for evaluating bearing capacity of helical piles." Journal of Korean Geosynthetics Society, Vol. 13, No. 4, pp. 77-85 (in Korean).

Lee, D. S. and Roh, N. J. (2010). "Future strategy for the oil industry: Crude oil procurement strategy." Korea Energy Economics Institute, Vol. 10, No. 24, p. 27 (in Korean).

Lee, J., Lee, K. and Kim, D. (2017). "Analysis of axial capacity and constructability of helical pile with inner cone penetration." Journal of Korean Geosynthetics Society, Vol. 16, No. 4, pp. 1-11 (in Korean).

Lee, J. and Ko, H. (2007). "Development and future tasks of oil sands in Canada." Korea Institue for International Economic Policy, Vol. 1, No. 20, pp. 1-13 (in Korean).

Park, K. Y., Han, S. D., Han, H. J., Kang, K. S., Bae, W. and Rhee, Y. W. (2009). "A study on the trend of technology for the treatment of oil from oil sands by patent analysis." Journal of Clean Technology, Vol. 15, No. 3, pp. 210-223 (in Korean).

Prasad, Y. V. S. N. and Rao, S. N. (1996). "Lateral capacity of helical piles in clays." Journal of Geotechnical Engineering, Vol. 122, No. 11, pp. 938-941.

Sakr, M. (2010). "Lateral resistance of high capacity helical piles - case study." 63rd Canadian Geotechnical and 6th Canadian Permafrost Conference, Calgary, Alberta, pp. 402-412.

SIMULIA (2014). 6.14 Documentation Collection, ABAQUS/CAE User΄ Manual.