TY  - RPRT
A1  - Vaupel, J.W.
A1  - Gambill, B.A.
A1  - Yashin, A.I.
T1  - Thousands of data at a glance – Shaded contour maps of demographic surfaces
Y1  - 1987
PB  - International Institute for Applied Systems Analysis
CY  - Laxenburg

ER  -