Adel Aziz, M., Butris, R. (2007). The existence and approximation of the periodic solutions for system of second order nonlinear differential equationsby using Lebesgue integrable. , 19(4), 80-106. doi: 10.33899/edusj.2007.5922
Merna Adel Aziz; R.N. Butris. "The existence and approximation of the periodic solutions for system of second order nonlinear differential equationsby using Lebesgue integrable". , 19, 4, 2007, 80-106. doi: 10.33899/edusj.2007.5922
Adel Aziz, M., Butris, R. (2007). 'The existence and approximation of the periodic solutions for system of second order nonlinear differential equationsby using Lebesgue integrable', , 19(4), pp. 80-106. doi: 10.33899/edusj.2007.5922
Adel Aziz, M., Butris, R. The existence and approximation of the periodic solutions for system of second order nonlinear differential equationsby using Lebesgue integrable. , 2007; 19(4): 80-106. doi: 10.33899/edusj.2007.5922


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