Nathan (Ben-Gurion University of the Negev, Beer Sheva, Israel) Blaunstein & Eugeniu Plohotniuc 
Ionosphere and Applied Aspects of Radio Communication and Radar [PDF ebook] 

Until recently, much of the communications technology in the former Eastern bloc countries was largely unknown. Due to the historically competitive nature of East/West relations, scientific groups operated independently, without the benefit of open communication on theoretical framework