TY - JOUR ID - 20803 TI - سرمقاله JO - مجله ی مهندسی مکانیک شریف JA - J40 LA - fa SN - 2676-4725 Y1 - 1993 PY - 1993 VL - 9 IS - 4 SP - 4 EP - 4 KW - - DO - N2 - - UR - https://sjme.journals.sharif.edu/article_20803.html L1 - https://sjme.journals.sharif.edu/article_20803_d51d6e60a5ce09ead7fea729aa75e859.pdf ER -