3 adjectives to describe attribution

It would be difficult to make a stronger case short of a contemporaneous attribution.

[Note: Works by other writers are indicated by italics; doubtful attributions by (?).

" Licinio, whose name has been proposed as the painter, did indeed follow out this particular vein of Giorgione's portraiture, so that "Style of Licinio" is not an altogether inapt attribution; but there is just that difference of quality between the one man's work and the other, which distinguishes any great man from his followers, whether in literature or in art.

3 adjectives to describe  attribution