an Entity references as follows:
The LF-107 Luňák (English: Kite) is a Czech aerobatic glider designed by Rudý Letov in the late 1940s. The design was developed within a prolific group of aeronautical engineers and sailplane pilots, including K. Dlouhý (later author of LET L-13 Blaník), J. Matejček, and B. Boček, led by chief designer Vladimír Štros.