@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/