WASET
    Minyar Sassi and  Amel Grissa-Touzi,  Contribution to the Query Optimization in the Object-Oriented Databases.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2007, vol. 11(11). 3538 - 3541
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/13754.