Do the sums of Primary, Secondary, Tertiary (and Quaternary) correspond to van Puijenbroek (2019)? https://www.sciencedirect.com/science/article/pii/S0301479718311824?via%3Dihub Also check future projections: https://www.sciencedirect.com/science/article/pii/S0301479723017097
Do the sums of Primary, Secondary, Tertiary (and Quaternary) correspond to van Puijenbroek (2019)? https://www.sciencedirect.com/science/article/pii/S0301479718311824?via%3Dihub
Also check future projections: https://www.sciencedirect.com/science/article/pii/S0301479723017097