Maslina Darus and Khalifa Al-Shaqsi, Differential Sandwich Theorems with Generalised Derivative Operator. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. February 2008, vol. 14(2). 149 - 152 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/13046.