HTIE: A Hierarchical Task Identification Framework for E-mails. - Ashish Chouhan; Venkata Siva Rami Reddy Sangireddy; Sarath Kumar Sridharababu; Syed Sameer Iqbal Fatmi; Dinesh Kumar Selvaraj; Anil Kumar Kanasani; Christoph Schneider; Florian Knupp; Iuliia Tumanova; Ajinkya Prabhune (BigDataService, 2021)