Man pages matching name graph::writer::dsm in section 3pm:

Graph::Writer::DSM.3pm.en	debian 10 / libgraph-writer-dsm-perl
Graph::Writer::DSM.3pm.en	debian 11 / libgraph-writer-dsm-perl
Graph::Writer::DSM.3pm.en	debian 12 / libgraph-writer-dsm-perl