@article{BSL8_3_Arruda_Alves2,
author = {Ayda I. ARRUDA and El{\'{\i}}as H. ALVES},
title = {A Semantical Study of Some Systems of Vagueness Logic},
journal = {Bulletin of the Section of Logic},
volume = {8},
number = {3},
year = {1979},
pages = {139--144}
}