Actual use of gotra (=vr.ddha) and yuvan

[Jean-Luc Chevillard]

Dear list members,

I would like to have information regarding the actual use of /gotra/ (or 
/vṛddha/ ?) and /yuvan/ for referring to individuals or for adressing them.

I would like to have a clear understanding of the purport of the 
following two sūtra-s (found among the sūtra-s of Pāṇini but said to be 
in fact vārttika-s):

vṛddhasya ca pūjāyām || PS_4,1.166 || {{Vasu: "The Gotra is sometimes 
optionally regarded as Yuvan, when respectful reference to him is 
intended"}} {{Boehtlingk: "Auch statt des Geschlechtsnamens kann man das 
zweite Patronymicum brauchen, wenn man Jemand ehren will."}} {{Renou: 
"(Le nom technique de /yuvan/) peut être le substitut (du patronymique 
restreint) dit /vṛddha/ quand il y a intention d'honorer."}}

yūnaś ca kutsāyām || PS_4,1.167 || {{Vasu: "The Yuvan is optionally 
spoken of as Gotra, when contemptuous reference to him is intended"}} 
{{Boehtlingk: "Auch den Juvan kann man mit dem Geschlechtsnamen 
bezeichnen, wenn man ihn schmähen will"}} {{Renou: "(Le nom technique de 
/vṛddha/) peut être le substitut du nom de /yuvan/ quand il y a 
intention de critiquer"}}

Has anybody written (in English, or French, or German, ...) on the 
actual use as seen in literature, in inscriptions, etc.?

I would be grateful for any bibliographical pointer or for comments.

-- Jean-Luc Chevillard (Paris)