The Stanzas on vibration : the Spandakārikā with four commentaries : the spandasamdoha by Ksemarāja, the Spandavrtti by Kallaṭabhaṭṭa, the Spandavivq̣ti by Rājānaka Rāma, the Spandapradīpikā by Bhagavadutpala / translated with introduction and exposition by Mark S.G. Dyczkowski.