@article { author = {محمدیان, دکتر منصور}, title = {-}, journal = {Journal of Environmental Studies}, volume = {7}, number = {7}, pages = {-}, year = {1977}, publisher = {دانشگاه تهران}, issn = {1025-8620}, eissn = {2345-6922}, doi = {}, abstract = {-}, keywords = {}, title_fa = {اهمیت تئوری سیستم ها درآموزش علم بوم شناسی}, abstract_fa = {}, keywords_fa = {}, url = {https://jes.ut.ac.ir/article_14924.html}, eprint = {https://jes.ut.ac.ir/article_14924_edcc0d7993476673135d30bc0ddaa55c.pdf} }