मूल लेख
Precipitation hardening of Cu-Be alloys
Enrique Rocha-Range, JosÃÆÃÆÃâÃÆÃÆÃâÃâé A.RodrÃÆÃÆÃâÃÆÃÆÃâÃâÃÂguez-GarcÃÆÃÆÃâÃÆÃÆÃâÃâÃÂa, Cons tantin A.HernÃÆÃÆÃâÃÆÃÆÃâÃâández-Bocanegra