Gül, E. 1999. An application of Gauss Bonnet Theorem. Pro-Mathematica , vol.13, no.25-26 , 11-16.

Gül, E., (1999). An application of Gauss Bonnet Theorem. Pro-Mathematica , vol.13, no.25-26, 11-16.

Gül, Erdal. "An application of Gauss Bonnet Theorem," Pro-Mathematica , vol.13, no.25-26, 11-16, 1999

Gül, Erdal. "An application of Gauss Bonnet Theorem." Pro-Mathematica , vol.13, no.25-26, pp.11-16, 1999

Gül, E. (1999) . "An application of Gauss Bonnet Theorem." Pro-Mathematica , vol.13, no.25-26, pp.11-16.

@article{article, author={Erdal GÜL}, title={An application of Gauss Bonnet Theorem}, journal={Pro-Mathematica}, year=1999, pages={11-16} }