Books on Indo-European

[Frank Rossi]

Any suggestions on the latest books (or articles) in any language dealing
coprehensively with:

a)  the Indo-European Urheimat question and taking into account all the
latest theories;

b) pre Indo-European languages in Europe (in particular taking into account
- pro et contra - Leo Vennemann's theories - Vasconic, Atlantic substate of
insular Celtic, etc.)

Thanks and regards
Frank Rossi
iglesias at axia.it