GRETCHIKHIN, Leonid I. Closed-type wing for drones: positive and negative characteristics. Vojnotehnički glasnik / Military Technical Courier, [S. l.], v. 62, n. 1, p. 130–140, 2013. DOI: 10.5937/vojtehg62-4739. Dostupno na: https://asistent.ceon.rs/index.php/vtg/article/view/4739. Pristupljeno: 12 jul. 2026.