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\mathcal{Y}_k[r_1,r_2]=\frac{1}{T_1T_2}\sum_{m_1=-
\infty}^{\infty}\sum_{m_2=-\infty}^{\infty}
\mathcal{X}_k\bigg(\frac{2\pi}{T_1}\bigg(\frac{r_1}{N_1}
-m_1\bigg),\frac{2\pi}{T_2}\bigg(\frac{r_2}{N_2}-
m_2\bigg)\bigg)
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\mathcal{Y}_k[r_1, r_2] = \frac{1}{T_1T_2} \sum_{m_1 = - \infty}^{\infty} \sum_{m_2 = - \infty}^{\infty} \mathcal{X}_k \bigg(\frac{2\pi}{T_1}\bigg(\frac{r_1}{N_1} - m_1\bigg), \frac{2\pi}{T_2}\bigg(\frac{r_2}{N_2} - m_2\bigg)\bigg)