Cp. Xing et H. Niederreiter, DRINFELD MODULES AND ALGEBRAIC-CURVES WIT H MANY RATIONAL-POINTS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 322(7), 1996, pp. 651-654
We construct algebraic curves C defined over a finite field F-q such t
hat the number of F-q-rational points of C is large relative to the ge
nus of C. The methods of construction are based on the relationship be
tween algebraic curves and their function fields, as well as on narrow
ray class extensions obtained from Drinfeld modules of rank 1.