Sarva-maṇḍala-sāmānya-vidhi-guhya Tantra 

‘The Secret Tantra concerning the General Rituals for all Maṇḍalas’, an important early tantric work, later classed as a kriyā-tantra, which describes the basic procedures for creating and using maṇḍalas for initiation (abhiṣeka). No Sanskrit version survives although a Tibetan and Chinese translation exists.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)