Stoyan Nedkov, Georgi Zhelezov, Nadezhda Ilieva, Mariyana Nikolova, Boian Koulov, Kliment Naydenov, Steliyan Dimitrov <br/><br/>
Smart Geography 

 -  Springer  Springer  2020 
<br/><br/><label>ISBN: </label>9783030281915 
<br/><br/><label>Source: </label>EBOOK