@article{ref1,
title="Programmed learning, an audio-visual method of teaching manual skills to dental students",
journal="Journal of the Indian Dental Association",
year="1972",
author="Das, Sreekanta and Das, A. K.",
volume="44",
number="6",
pages="127-129",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0019-4611",
doi="",
url="http://dx.doi.org/"
}