Nghi, N.
(1999).
 On linear multipoint boundary - value problems for index-2 differentiable - algebraic equations.
<em>VNU Journal Of Science: Natural Sciences And Technology, 15</em>(1).
Retrieved from <a href="https://js.vnu.edu.vn/NST/article/view/3728" target="_new">https://js.vnu.edu.vn/NST/article/view/3728</a>