Zhang Mou. ON THE EXISTENCE OF LIMIT CYCLES OF A CLASS NONLINEAR EQUATION[J]. Journal of Civil and Environmental Engineering, 1994, 16(1).

DOI：

Zhang Mou. ON THE EXISTENCE OF LIMIT CYCLES OF A CLASS NONLINEAR EQUATION[J]. Journal of Civil and Environmental Engineering, 1994, 16(1). DOI： 10.11835/j.issn.1674-4764.1994.01.003.