Monitoring and modelling service level agreement of multiple virtual machines in cloud computing. - Abdel-Rahman Al-Ghuwairi; Zaher Salah; Ayoub Alsarhan; Shatha Al Qudah; Ghadeer Al Qahmous; Aladdin Hussein Baarah; Ahmad A. Al-Oqaily (Int. J. Bus. Inf. Syst., 2018)