Natyashastra
स्फुरदाश्लिष्टपक्ष्माग्रा मुकुलोर्ध्वपुटाञ्चिता । सुखोन्मीलिततारा च मुकुला दृष्टिरिष्यते॥७२॥
Mukulā: The Glance in which eyelashes are slightly trembling, the upper eyelids are of the Mukula type and the eyeballs are opened in happiness, is called Mukulā.
english translation
sphuradAzliSTapakSmAgrA mukulordhvapuTAJcitA । sukhonmIlitatArA ca mukulA dRSTiriSyate॥72॥
hk transliteration by Sanscript