It is empirically shown that, even using the normal or total counting proce
dure, Lotka's law breaks down when articles with a large, i.e., more than h
undred, number of authors are included in the bibliography, The explanation
of this phenomenon is that the conditions for an application of the basic
success-breeds-success model are not fulfilled any more. Studying articles
with many authors means dealing with items (the articles) having multiple s
ources (the authors), hence Egghe's generalized success-breeds-success mode
l, leading to not necessarily decreasing distributions, explains the observ
ed irregularities.