• ed. T. R. Chintamani, prefaced by Kunhan Raja, Madras University Sanskrit Series no. 11,
1937, which should be available through the DLI (but it does not function in this case) :
Would the commentary refer to that work (which I am presently unable to check fully)?
Or would it be possible that there exists a (mīmāṃsā or niyāya, possibly lost) sūtra-work dealing with śabda-topic and authored by another (older) Bhoja?
Note that Aruṇagirinātha in his com. to Kumārasambhava 4,63 (cf. also Nārāyaṇa Paṇḍita ad loc.) refers to a grammatical sūtra by Bhoja in the followin manner :
tadādau ceti bhojasūtram
(TSS 32, p. 251-2: https://ia601602.us.archive.org/20/items/Trivandrum_Sanskrit_Series_TSS/TSS-032_Kumarasambhava_Part_2_-_TG_Sastri_1913.pdf )
Thank you for any comment or help in that matter.
* which is different from Bhoja's encyclopaedic work on poetics/rhetorics samely entitled Sarasvatī-kanṭhābharaṇa, in 5 paricchedas, available through the following editions:
• Narayan Yantralay, Calcutta, 1937 :
[cover in Bengali script but the few visible pages appear in nagari]
• ed. Biswanath Bhattacharya, Banaras Hindu University Sanskrit series v. 14, 1979
Note that I do not know which (of the two) Sarasvatī-kanṭhābharaṇa was edited by Anundoram Borooah in 1883, reprinted Gauhati, Publ. Board Assam, 1969 and, more recently, within the Works of Anundoram Borooah : with a note on Anundoram Barooah and his works by Malinee Goswami, Guwahati : Publication Board Assam, 2007, pp. 667-1050, and which could therefore constitute the editio princeps of one or the other work.