1895 Conway & Rouse tr. Brugmann IV. 371 Special vowel-grades for the root-syllable, as in the s-aorist.., cannot be made out for the parent language.
1933 C. D. Buck 281 The distinctive IE aorist is the s-aorist formed from the root by the addition of s and the secondary endings.
1962 C. W. Watkins i. 55 The more common situation in Vedic is one where a root athematic present has an s-aorist associated with it.