@inproceedings{inproceedings48036396,
title   = {Assessing the conditioned reinforcing value of stimuli that signal reinforcement (S+) and extinction (S-) in the maintenance of pigeons' observing responses},
author = {Tomanari, Gerson Yukio and Machado, Ligia Marcondes},
year = {1998},
publisher = {DPE-Universidade de Sevilla},
booktitle   = {International Congress on Behaviorism and the sciences of Behavior}
}