@article {FrVe97b,
AUTHOR = {Friedman, Sy D. and Velickovic, Boban},
TITLE = {Nonstandard models and analytic equivalence relations},
JOURNAL = {Proc. Amer. Math. Soc.},
FJOURNAL = {Proceedings of the American Mathematical Society},
VOLUME = {125},
YEAR = {1997},
NUMBER = {6},
PAGES = {1807--1809},
}