Search in the Online Catalogue of the Ludwigshafen University Library、2021年11月10日閲覧。 Printed Books published 2017–2019 ((JHR=2017 OR JHR=2018 OR JHR=2019) AND ((ZNR=oai2017* OR ZNR=17* OR ZNR=2017* OR ZNR=oai2018* OR ZNR=18* OR ZNR=2018* OR ZNR=oai2019* OR ZNR=19* OR ZNR=2019*) AND VBN=*)): 6879 hits. English printed books published 2017–2019 (JHR=2017 OR JHR=2018 OR JHR=2019) AND ((ZNR=oai2017* OR ZNR=17* OR ZNR=2017* OR ZNR=oai2018* OR ZNR=18* OR ZNR=2018* OR ZNR=oai2019* OR ZNR=19* OR ZNR=2019*) AND VBN=* AND SPR=eng): 860 hits. E-books published 2017–2019 ((JHR=2017 OR JHR=2018 OR JHR=2019) AND (ARI=zdb* OR ARI=iall OR SWT=ebook)): 13556 hits. English e-books published 2017–2019 ((JHR=2017 OR JHR=2018 OR JHR=2019) AND (ARI=zdb* OR ARI=iall OR SWT=ebook) AND SPR=eng): 5268 hits. 6879+13556=20435. 860+5268=6128. 6128/20435=0,30
Search in the Online Catalogue of the Ludwigshafen University Library、2021年11月10日閲覧。 Printed Books published 2017–2019 ((JHR=2017 OR JHR=2018 OR JHR=2019) AND ((ZNR=oai2017* OR ZNR=17* OR ZNR=2017* OR ZNR=oai2018* OR ZNR=18* OR ZNR=2018* OR ZNR=oai2019* OR ZNR=19* OR ZNR=2019*) AND VBN=*)): 6879 hits. E-books published 2017–2019 ((JHR=2017 OR JHR=2018 OR JHR=2019) AND (ARI=zdb* OR ARI=iall OR SWT=ebook)): 13556 hits