ÇAY, İ. And ÇAY, M. T. 1998. The sunspot observations made in 1993. PIstO , vol.168 .

ÇAY, İ., & ÇAY, M. T., (1998). The sunspot observations made in 1993. PIstO , vol.168.

ÇAY, İpek, And Mehmet Taşkın ÇAY. "The sunspot observations made in 1993," PIstO , vol.168, 1998

ÇAY, İpek And ÇAY, Mehmet T. . "The sunspot observations made in 1993." PIstO , vol.168, 1998

ÇAY, İ. And ÇAY, M. T. (1998) . "The sunspot observations made in 1993." PIstO , vol.168.

@article{article, author={İpek ÇAY And author={Mehmet Taşkın ÇAY}, title={The sunspot observations made in 1993}, journal={PIstO}, year=1998}