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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 H01 Natural Sciences D010811 +
 H01.862 Time D013995 +
 H01.862.200 Chronology D002910 
 H01.862.405 Half-Life D006207 
 H01.862.645 Periodicity D010507 +
 H01.862.857 Time Factors D013997 
 H01.862.675 Photoperiod D017440