There are few articles and books dedicated to this subject. Below are some interesting references about the managerial challenges and technical aspects of buying abroad.

Buying abroad
Resource My rating
Very, P. and D.M. Schweiger
"The Acquisition Process as a Learning Process: Evidence from a Study of Critical Problems and Solutions In Domestic and Cross-Border Deals"
Journal of World Business, 36(11): p. 11-31 (2001)
An article underlining how the global process is affected when entering an unknown country through an acquisition. Also recommended to find out about problems faced by buyers and their solutions.
This article is part of a special edition of the Journal of World Business devoted to cross-border mergers and acquisitions, which also includes an interview of Carlos Ghosn, CEO of Renault Nissan.
Schweiger, D.M., E.N. Csiszar, and N.K. Napier
"Implementing International Mergers and Acquisitions"
Human Resource Planning, 16(1): p. 53-70 (1993)
An article which reflects upon how to conduct the integration phase, with a focus on foreign operations.
The Acquisitions Monthly magazine (or its French brother : magazine Fusions & Acquisitions) This magazine often deals with the specific issues of entering a given country, in the upstream phase of the process (for example, legal and fiscal dimensions in Finland). The articles are written by consultants who are specialists in their own countries.