Effect of Atrazine and Spermine on Free Proline Content and Some Antioxidants in Pea (Pisum sativum L.) Plants Sergiev, I. ; Alexieva, V. ; Yanev, S. ; Karanov, E. Abstract Publication: Comptes Rendus de l'Academie Bulgare des Sciences Pub Date: 2000 Bibcode: 2000CRABS..53j..63S