public AbcdSquared(double a, double b, double c, double d, double T, double S)
{
abcd_ = new AbcdFunction(a, b, c, d);
T_ = T;
S_ = S;
}
public double abcdBlackVolatility(double u, double a, double b, double c, double d)
{
AbcdFunction model = new AbcdFunction(a, b, c, d);
return(model.volatility(0.0, u, u));
}