@article{701311,
     title = {An elementary approach to some applications of nonstandard analysis},
     booktitle = {Proceedings of the 11th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1984},
     pages = {[197]-200},
     mrnumber = {MR0744384},
     zbl = {0548.46061},
     url = {http://dml.mathdoc.fr/item/701311}
}

Neubrunn, T.; Riečan, B.; Riečanová, Z. An elementary approach to some applications of nonstandard analysis, dans Proceedings of the 11th Winter School on Abstract Analysis, GDML_Books,  (1984), pp. [197]-200. http://gdmltest.u-ga.fr/item/701311/