The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries. - Sanidas, S.; Cooper, S.; Bassa, C. G.; Hessels, J. W. T.; Kondratiev, V. I.; Michilli, D.; Stappers, B. W.; Tan, C. M.; van Leeuwen, J.; Cerrigone, L.; Fallows, R. A.; Iacobelli, M.; et al. (Astronomy & Astrophysics / Astronomie et Astrophysique, 2019)