> I tend to believe that ka. refers to the Pa~ncama-sa`ngiiti edition.
> However, whether ka. is an abbreviation of tipita_ka_, I am not sure.
It should be the abbreviation for Kamboja (Cambodian edition). In some
Sri Lanka Pali publications, e.g. A P Buddhadatta's ed. of
Dhammapada.t.thakathaa, Ka stands for Cambodian.