TY  - JOUR
A1  - Tobler, Waldo R.
T1  - Smooth pycnophylactic interpolation for geographical regions
Y1  - 1979
UR  - 10.1080/01621459.1979.10481647
JF  - Journal of the American Statistical Association
VL  - 74
IS  - 367
SP  - 519
EP  - -530

ER  -