Why Reinvent the Wheel: Let's Build Question Answering Systems Together. - Kuldeep Singh 001; Arun Sethupat Radhakrishna; Andreas Both 001; Saeedeh Shekarpour; Ioanna Lytra; Ricardo Usbeck; Akhilesh Vyas; Akmal Khikmatullaev; Dharmen Punjani; Christoph Lange 002; Maria-Esther Vidal; Jens Lehmann 001; et al. (WWW, 2018)