Madhyamaka, also known as the "Middle Way" philosophy, is a school of thought in Mahayana Buddhism that emphasizes the concept of emptiness (śūnyatā) and the rejection of inherent existence in all things. This philosophy was founded by the Indian philosopher Nagarjuna in the 2nd century CE and has had a significant influence on Buddhist thought and practice.

Some key texts in Madhyamaka philosophy include:

1. The Mulamadhyamakakarika (Fundamental Verses on the Middle Way) by Nagarjuna - This is considered the foundational text of Madhyamaka philosophy and is composed of 27 chapters that explore the concept of emptiness and its implications for understanding reality.

2. The Madhyamakavatara (Introduction to the Middle Way) by Chandrakirti - This text is a commentary on Nagarjuna's Mulamadhyamakakarika and is considered one of the most important works in Madhyamaka philosophy. It provides a detailed analysis of emptiness and its relationship to conventional reality.

3. The Shunyatasaptati (Seventy Verses on Emptiness) by Aryadeva - This text is another important commentary on Nagarjuna's Mulamadhyamakakarika and explores the concept of emptiness in relation to the Buddhist path and the attainment of enlightenment.

4. The Madhyamakalankara (Ornament of the Middle Way) by Shantarakshita - This text is a comprehensive treatise on Madhyamaka philosophy and examines the concept of emptiness in relation to other Buddhist teachings, such as the Four Noble Truths and the Twelve Links of Dependent Origination.

5. The Madhyamakahrdayakarika (Heart of the Middle Way) by Bhavaviveka - This text is a commentary on Nagarjuna's Mulamadhyamakakarika and presents a critique of other Buddhist schools of thought, such as the Yogacara and Sautrantika, from a Madhyamaka perspective.

In addition to these key texts, there are also numerous other commentaries, treatises, and teachings on Madhyamaka philosophy by various Buddhist scholars and masters throughout history. Some notable figures include Nagarjuna's disciple Aryadeva, the Indian scholar Candrakirti, and the Tibetan masters Je Tsongkhapa and Longchenpa.

Overall, the key texts and teachings in Madhyamaka philosophy provide a deep and nuanced understanding of emptiness and its implications for our understanding of reality. They also offer practical guidance on how to apply this understanding to our spiritual practice and ultimately attain liberation from suffering.