@article{Ullman1974, author = {M. Ullman}, title = {Los factores sociales en los sue{\~n}os}, journal = {Revista de Psicoan{\´a}lisis, Psiquiatr{\´i}a y Psicolog{\´i}a, M{\´e}xico (No. 4, 1974), pp. 65-75.}, year = {1974}, }