1. Eyelink products. https://www.sr-research.com/hardware/. Eyelink products. https://www.sr-research.com/hardware/.
2. Pupil labs products. https://pupil-labs.com/products/. Pupil labs products. https://pupil-labs.com/products/.
3. T-distribution table. https://www.statisticshowto.com/tables/t-distribution-table/. T-distribution table. https://www.statisticshowto.com/tables/t-distribution-table/.
4. Tobii pro nano. https://www.tobiipro.com/product-listing/nano/. Tobii pro nano. https://www.tobiipro.com/product-listing/nano/.
5. Tobii products. https://www.tobiipro.com/product-listing/. Tobii products. https://www.tobiipro.com/product-listing/.