CARBONE, A. (1996). AN EXTENSION OF A BEST APPROXIMATION THEOREM. International Journal of Mathematics and Mathematical Sciences, 1996(), 711-716. https://doi.org/10.1155/S016117129600097X
ALMIRA, J. M., TORO, N. D., & MORENO, A. J. L. (2005). A NOTE ON DIOPHANTINE APPROXIMATION. International Journal of Mathematics and Mathematical Sciences, 2005(), 487-490-035. https://doi.org/10.1155/IJMMS.2005.487