  The problem of aggregation processes in alignments is the subject of a paper
published in a Statistical Physics Journal (Physica A 230 (1996) 174-188). Two
models are presented and discussed in that paper. First the energy landscape
model proposed by Axelrod and Bennett (B. J. Pol. S. 23 (1993) 211-233) is
analysed. The model is shown not to include most of its claimed results. Then a
second model is presented to reformulate correctly the problem within
statistical physics and to extend it beyond the initial Axelrod-Bennett
analogy.
