http://jsci.khu.ac.ir Quarterly Journal of Science Kharazmi University - Journal articles for year 1991, Volume 1371, Number 4 Yektaweb Collection - https://yektaweb.com en 1991/1/11 http://system.khu.ac.ir/jsci/browse.php?a_id=1277&sid=1&slc_lang=en 7 http://system.khu.ac.ir/jsci/browse.php?a_id=1276&sid=1&slc_lang=en 6 http://system.khu.ac.ir/jsci/browse.php?a_id=1275&sid=1&slc_lang=en 5 http://system.khu.ac.ir/jsci/browse.php?a_id=1274&sid=1&slc_lang=en 44 http://system.khu.ac.ir/jsci/browse.php?a_id=1273&sid=1&slc_lang=en 3 http://system.khu.ac.ir/jsci/browse.php?a_id=1272&sid=1&slc_lang=en 2 http://system.khu.ac.ir/jsci/browse.php?a_id=1271&sid=1&slc_lang=en 1