kimakṣarasya svaryamāṇasya svaryate ⃒ ardhaṁ hrasvasya pādo dīrghasyetyeke ⃒ sarvamiti śāṅkhamitriḥ ⃒ akṣarasyaiṣā vidhā na vidyate yad dvisvarībhāvaḥ ⃒- Deshpande (1997), a pag.3.3.31-34
svaro`kṣaram ⃒- Deshpande (1997), a pag.1.4.2