@book
{TN_libero_mab2,
author = {
Heikkinen, Markku
},
title = {
Solving the shape of the earth by using digital density models
},
publisher = {Geodet. Inst},
isbn = {9517110693},
year = {1981},
booktitle = {Suomen Geodeettisen Laitoksen tiedonantoja ; 1981,2},
address = {
Helsinki
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}