_:nb4629088d23e47728ca007200b4ab1a2xb6
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<https://www.semanticscholar.org/author/D.-Soberman/1698729>
<https://www.semanticscholar.org/paper/Markets-for-Product-Modification-Information-Iyer-Soberman/e9a890d741af06530b4b7db2b103ef6f54e97b05?p2df>