Natyashastra
हर्षप्रसादजनिता कान्तात्यर्थं समन्यथा । सभ्रूक्षेपकटाक्षा च शृङ्गारे दृष्टिरिक्ष्यते ॥ ४६॥
Kāntā: When with a feeling of love a person contracts his eyebrows and castes a sidelong look, he is said to have a Kāntā (pleasing) Glance which has its origin in joy and pleasure. It is used in the Erotic Sentiment.
english translation
harSaprasAdajanitA kAntAtyarthaM samanyathA । sabhrUkSepakaTAkSA ca zaRGgAre dRSTirikSyate ॥ 46॥
hk transliteration by Sanscript