A complex surface of general type with p_g=0, K^2=3 and H_1=Z/2Z
  This paper is an addendum to [4], in which the authors constructed a simply connected minimal complex surface of general type with p_g=0 and K^2=3. In this paper we construct a new non-simply connected minimal surface of general type with p_g=0, K^2=3 and H_1=Z/2Z using a rational blow-down surgery and Q-Gorenstein smoothing theory. 
Heesang Park, Jongil Park and Dongsoo Shin