Salari P, Lashkaripour G, Ghafoori M. Presentation of Empirical Equations for Estimating Internal Friction Angle of SP and SC Soils in Mashhad, Iran Using Standard Penetration and Direct Shear Tests and Comparison with Previous Equations. 10 [Internet]. 2015 May 30 [cited 2024 Jun. 17];4(5):89-95. Available from: https://archive.conscientiabeam.com/index.php/10/article/view/1938