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<p>Ezt kérném, ha valaki hozzáférne:<br>
​<br>
Reinforcing properties of spontaneous activity in the rat. <br>
Collier, George; Hirsch, Edward <br>
Journal of Comparative and Physiological Psychology, Vol 77(1), Oct 1971, 155-160. <a href="http://psycnet.apa.org/doi/10.1037/h0031588" target="kTSWc57WdRjPJzSgm2833bR">http://dx.doi.org/10.1037/h0031588</a><br>
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Hálás köszönettel,<br>
Oláh Edit<br>
<span style='font-family: "comic sans ms", sans-serif; font-size: large;'>Állatorvostudományi Egyetem</span><br style='font-family: "comic sans ms", sans-serif; font-size: large;'>
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