How can I express the time between late 80s and beginning of 90s (somewhere around 1988-1992)?

I am trying to translate the title of my thesis:

"Establishment of Political Parties in Georgia (at the conjunction of 80s and 90s of the 20th century)"

I am no sure about the part in bold. There, I want to express the time period spanning the last two years of 1980s (1988, 1989) and the first three years of 1990s (1990, 1991, 1992).

Is what I wrote correct, or is there any better expression for that?

"Establishment of Political Parties in Georgia (1988–1992)"

Oliver's answer seems best and most precise, but if you are looking for something more vague, "conjunction" is awkward usage.

If anything, you could say "at the turn of the 1990s"; we don't talk about the turn of decades as often as we do the "turn of the century" but it's as valid and easily understandable.

See also: https://ell.stackexchange.com/questions/78220/about-the-period-of-from-the-turn-of-the-decade