[Advaita-l] A query on finding the source a verse

[Sunil Bhattacharjya]

Dear friends,

I understand that Adi Shankara composed the following verse on Lord Buddha, but I am unable to locate the source of the verse.

धराबद्धपद्मासनस्यांघ्रियष्टिर्नियम्यानिलो न्यस्तनासाग्रहदृष्टिः ।
य आस्ते कलौ योगिनां चक्रवर्ती  स बुद्धः प्रबुद्धोऽस्तु निश्चित्तवर्ती ॥

I shall be grateful if any of you can help me find the source.

Regards,
Sunil KB