PEAR OS

https://pearos8.weebly.com/

http://www.softkom.rs/baza-znanja/izdavanje-racuna.html#unos

https://www.myexcelonline.com/blog/top-excel-formulas-function-examples-to-get-better-at-microsoft-excel/

https://medium.com/@jakubgarfield/the-best-c-articles-from-2019-9139d5dfeeec

https://www.poverenik.rs/sr-yu/saopstenja/3208-%D0%B4%D0%B5%D0%B7%D0%B8%D0%BD%D1%84%D0%BE%D1%80%D0%BC%D0%B0%D1%86%D0%B8%D1%98%D0%B0-%D1%84%D0%B8%D1%80%D0%BC%D0%B5-%D0%B2%D0%B8%D0%BD%D1%87%D0%B0-%D0%B4%D0%B0%D1%82%D0%B0-%D0%B0%D0%BD%D0%B0%D0%BB%D0%B8%D1%82%D0%B8%D0%BA%D0%B0-%D1%83-%D0%B2%D0%B5%D0%B7%D0%B8-%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D0%BD%D0%B8%D1%85-%D0%BB%D0%B8%D1%81%D1%82%D0%B0.html