Testing purposes
See the footnote testing here ¹

This is a test for the footnote feature in vCalc.²

This is a test for the footnote feature in vCalc.This is a test for the footnote feature in vCalc.
³

See the footnote testing here ⁴

1. ^ https://www.vcalc.com 
2. ^ !http://www.wikipedia.org
3. ^ Dilip Kondepudi, Ilya Prigogine, ''Modern Thermodynamics'', John Wiley & Sons,  
4. ^ https://www.vcalc.com