Ramayana
दूषणंचाग्रतोहत्वात्रिशिरास्तदनन्तम् । तस्तेनार्दिताबालारावणंसमुपागता ॥ ६-१२९-२१
"After killing Dushana (his brother) first, Trishira (the other brother) was killed thereafter. Then Surpanakha afflicted by Rama (the incident of destruction of Rakshasas) sought refuge with Ravana." ॥ 6-129-21॥
english translation
dUSaNaMcAgratohatvAtrizirAstadanantam । tastenArditAbAlArAvaNaMsamupAgatA ॥ 6-129-21
hk transliteration by Sanscript