@article{GDZPPN002220210,
title = {Two Principles for Extending Probability Measures.},
journal = {Manuscripta mathematica},
volume = {22},
year = {1977},
pages = {43-50},
zbl = {0368.60005},
url = {http://dml.mathdoc.fr/item/GDZPPN002220210}
}
Lehn, Jürgen; Ascherl, Albert. Two Principles for Extending Probability Measures.. Manuscripta mathematica, Tome 22 (1977) pp. 43-50. http://gdmltest.u-ga.fr/item/GDZPPN002220210/