Lv Yuhua, Positive Solutions of Initial Value Problem for the Systems of Second Order Integro-Differential Equations in Banach Space. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. September 2013, vol. 77(5). 901 - 904 [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/17086.