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Hovanec H., . (2001). Science puzzles Einsteins. ಬೆಂಗಳೂರು: Orient Paperbacks.
Hovanec Helence, . 2001. Science puzzles Einsteins. ಬೆಂಗಳೂರು: Orient Paperbacks.
Hovanec Helence, . Science puzzles Einsteins. ಬೆಂಗಳೂರು: Orient Paperbacks. 2001.