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https://en.wikipedia.org/wiki/ISBN

Unique numeric book identifier since 1970 International Standard Book Number Acronym ISBN Organisation International ISBN Agency Introduced 1970 ; 56 years ago ( 1970 ) [ 1 ] No. of digits 13 (formerly 10) Check digit Weighted sum Example 978-3-16-148410-0 Website isbn-internatio…

https://www.academia.edu/26658897/The_problem_of_small_footprints_in_paleoichnology_relate…

Rivista Italiana di Paleontologia e Stratigrafia volume 120 no. 2 pp. 129-143 July 2014 THE PROBLEM OF SMALL FOOTPRINTS IN PALEOICHNOLOGY: REMARKS ON THE EARLY PERMIAN ICHNOTAXON ERPETOPUS CASSINISI, A LOCAL SPECIES FROM SOUTHERN ALPS (NORTHERN ITALY) LORENZO MARCHETTI 1, GIUSEPP…