- https://www.radartutorial.eu/01.basics/Ecua%C5%A3ia%20radioloca%C5%A3iei.ro.html
- https://koaha.org/wiki/Zona_di_Fresnel
- https://latex.codecogs.com/legacy/eqneditor/editor.php?lang=ro-ro
- http://soundofscience.info/teoria-pamantului-plat-1/
- https://soundofscience.info/teoria-pamantului-plat-2/
- https://www.rador.ro/2016/02/13/documentar-universul-undelor-radio/
- https://ik-ptz.ru/ro/diktanty-po-russkomu-yazyku--2-klass/iskrivlenie-zemli-na-kilometr-vidimyi-gorizont-i-ego.html
Radar Fundamentals