Han, N.
(2008).
 On equations of motion, boundary conditions and conserved energy-momentum of the rigid string.
<em>VNU Journal Of Science: Mathematics - Physics, 24</em>(3).
Retrieved from <a href="https://js.vnu.edu.vn/MaP/article/view/3506" target="_new">https://js.vnu.edu.vn/MaP/article/view/3506</a>