TY  - BOOK
AU  - Gyllenbok,Jan
TI  - Time Measurements and Calendars
SN  - 978-3-319-57598-8
PY  - 2018///
CY  - Cham : 
PB  - Springer International Publishing
N1  - DOI: 10.1007/978-3-319-57598-8_4
ER  -