Y. Shandala, M., M. Al-Shamamry, M., A. A. Al-Wahab, H., & G. Salih, R. (1999). Physico-Chemical Study of Some Cross Conjugated Systems, Part II. Journal of Education and Science (JES), 24(3), 1–13. https://doi.org/10.33899/edusj.1999.58802