The Vaisheshika Sutras mention competing schools of Indian philosophy such as Samkhya and Mimamsa, but make no mention of Buddhism, which has led scholars in more recent publications to posit estimates of 6th century BCE. The Vaisheshika Sutras manuscript has survived into the modern era in multiple versions and the discovery of newer manuscripts in different parts of India by Thakur in 1957 and Jambuvijayaji in 1961, followed by critical edition studies, suggest that the text attributed to Kaṇāda was systematized and finalized sometime between 200 BCE and the start of the common era, with the possibility that its key doctrines may be much older. Multiple Hindu texts dated to the 1st and 2nd century CE, such as the Mahavibhas and Jnanaprasthana from the Kushan Empire, quote and comment on Kaṇāda's doctrines. His ideas are also mentioned in Buddhist texts attributed to Aśvaghoṣa of the same period.