1. working paper

    https://coar-rt.empedokl.es/c_8042

    A working or discussion paper circulated publicly or among a group of peers. Certain disciplines, for example economics, issue working papers in series. [Source: http://www.ukoln.ac.uk/repositories/digirep/index/Eprints_Type_Vocabulary_Encoding_Scheme#:~:text=http%3A//purl.org/eprint/type/WorkingPaper]