Son, N.P., Uyen, P.H. and Thien, N.D. 2018. On some nonlinear dependence structure in portfolio design. Science & Technology Development Journal: Economics- Law & Management. 2, 1 (Dec. 2018), 91-97. DOI:https://doi.org/https://doi.org/10.32508/stdjelm.v2i1.505.