Shiva Purana
अग्निष्टोमोऽतिरात्रश्चातिमन्युस्सुयशा दश॥ पूरोरजनयत्पुत्रान्षडाग्नेयी महाप्रभान् ॥ १५॥
Agnistoma, Atiratra, Atimanyu and Suyasha are the ten. Pūru gave birth to six sons, all of whom were very bright.
english translation
agniSTomo'tirAtrazcAtimanyussuyazA daza॥ pUrorajanayatputrAnSaDAgneyI mahAprabhAn ॥ 15॥
hk transliteration by Sanscript