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- 1989 ,č.211-216. Pyramída : Jadrová energia. Bratislava : Obzor, 1989. 1 zv. bez periodicity [Copy count : 1, currently available 0, at library only 1]
- 1989 ,č. 217-220. Pyramída : Elektronika a elektrotechnika. Bratislava : Obzor, 1989. 1 zv. bez periodicity [Copy count : 1, currently available 0, at library only 1]