Green, T. et al. (1976). US3939477A. Quadrupole Adcock Direction Finder and Antenna Therefor. Southwest Research Institute.
https://worldwide.espacenet.com/patent/search/family/023368218/publication/US3939477A?q=pn%3DUS3939477A

has been cited by the following article:

• TITLE: The WWII German UKW-Jäger-Sprechstelle Grille near Locronan (Finistère-FR)

  AUTHORS: Giancarlo T. Tomezzoli

  KEYWORDS: WWII, Finistère, Locronan, Charles Danielou, Plas ar Horn, Kerdelan Bihan, UKW-Jäger-Sprechstelle, Grille

  JOURNAL NAME: Archaeological Discovery, Vol.13 No.2, March 10, 2025

  ABSTRACT: The detail of the Flughafenbereich Morlaix—Flugplätze und Ln Anlagen map among some WWII German military installations in the south Finistère (FR) studied in past publications and other WWII German installations, discloses the UKW-Jäger-Sprechstelle Grille near Locronan (Finistère) to which, apparently, no author seems to have paid attention. In this article, the positions and the preservation state of the Grille components have been investigated and discussed. In addition, the map shows the presence of others German UKW-Jäger-Sprechstelle in Brittany, possible subjects for further studies.