Dear Omar Elbagalati, these links may be helpful

http://www.flexstudy.com/catalog/schpdf.cfm?coursenum=98007

https://www.wrike.com/blog/5-most-common-mistakes-in-managing-multiple-projects-learn-to-avoid-them-part-1/

http://csengineermag.com/article/project-profitability-managing-multiple-projects/

https://www.fmmagazine.com.au/sectors/overcoming-challenge-multi-site-facility-management/

Dear Mohannad thanks a lot

Hello Omar,

I suggest the following article:

file:///C:/Users/master/Downloads/11SO-Kane.pdf

Also, the following, although not a technical paper, does contain some useful tips:

https://www.girlsguidetopm.com/how-to-manage-multiple-projects-at-the-same-time/