@article{santos_2016,  title={Existence of Solutions for Optimal Control Problems on Time Scales whose States are Absolutely Continuous},  volume={17},  ISSN={2179-8451},  url={https://doi.org/10.5540/tema.2016.017.01.0081},  DOI={10.5540/tema.2016.017.01.0081},  number={1},  journal={TEMA (São Carlos)},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={SANTOS, I.L.D.},  year={2016},  month={Jan},  pages={81–92} }