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An Inventory for Measuring Depression

The difficulties inherent in obtaining consistent and adequate diagnoses for the purposes of research and therapy have been pointed out by a number of authors. Pasamanick<sup>12...

1961 Archives of General Psychiatry 37547 citations

The Evolution of Cooperation

Cooperation in organisms, whether bacteria or primates, has been a difficulty for evolutionary theory since Darwin. On the assumption that interactions between pairs of individu...

1981 Science 20009 citations