الوصول الحر: http://kipublications.ki.se/Default.aspx?queryparsed=id:150285004Test
الإتاحة: https://doi.org/10.1016/s0944-7113Test(00)80014-8https://api.elsevier.com/content/article/PII:S0944711300800148?httpAccept=text/xmlTesthttps://api.elsevier.com/content/article/PII:S0944711300800148?httpAccept=text/plainTest