Nagarjuna's Verses of the Center

Here's a fine document with the Nagarjuna's classic Mulamadhyamakakarika translated from the tibetan text by Stephen Batchelor.

"Mulamadhyamakakarika, or Fundamental Verses on the Middle Way, is a key text by Nagarjuna, one of the most important Buddhist philosophers. It now stands at the centre of modern philosophical analysis of the Madhyamaka philosophy, which is rapidly proliferating to match the rich and varied commentarial tradition that the text has accumulated over the centuries since its composition (most likely in the 2nd century)."

You can find some more info about the text at Wikipedia.