Qasem, F. Y. A., and W. H. A. Hadi. “On a Generalized ?R- Birecurrent Finsler Space”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 19, no. 1, May 2016, pp. 9-18, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1433.