Analysis of information sources in references of the Wikipedia article "Konstantin Țiolkovski" in Romanian language version.
|title= (ajutor)|title= (ajutor)The concept was first described in 1895 by Russian author K.E. Tsiolkovsky in his "Speculations about Earth and Sky and on Vesta."
|title= (ajutor)|title= (ajutor)The concept was first described in 1895 by Russian author K.E. Tsiolkovsky in his "Speculations about Earth and Sky and on Vesta."
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