@article { author = {}, title = {ON TE EXISTENCE OF PERIODIC SOLUTION FOR CERTAIN NONLINEAR THIRD ORDER DIFFERENTIAL EQUATIONS}, journal = {Journal of Sciences, Islamic Republic of Iran}, volume = {3}, number = {2}, pages = {-}, year = {1992}, publisher = {University of Tehran}, issn = {1016-1104}, eissn = {2345-6914}, doi = {}, abstract = {}, keywords = {}, url = {https://jsciences.ut.ac.ir/article_31520.html}, eprint = {https://jsciences.ut.ac.ir/article_31520_9bade70fb476f8f4cbdbe359cbbbbdaa.pdf} }