TY - JOUR A1 - Ahrens, J. A1 - Kiel, B. T1 - Helicity Dependence of γp → Nπ below 450 MeV and Contribution to the Gerasimov-Drell-Hearn Sum Rule JF - Phys. Rev. Lett. 84 Y1 - 2000 SP - 5950 EP - 5954 ER -