Title: Human performance on negative-slope schedules of reinforcement
Description: <a href="http://uf.catalog.fcla.edu/uf.jsp?st=UF028024878&ix=pm&I=0&V=D&pm=1" rel="nofollow">http://uf.catalog.fcla.edu/uf.jsp?st=UF028024878&ix=pm&I=0&V=D&pm=1</a>