TY - JOUR AU - Paul Gabrielsen BT - Proceedings of the National Academy of Sciences DA - 2016-10 DO - 10.1073/pnas.1614516113 PY - 2016 EP - 201614516 T2 - Proceedings of the National Academy of Sciences TI - Profile of Henry Kapteyn UR - http://www.pnas.org/lookup/doi/10.1073/pnas.1614516113 SN - 0027-8424 ER -