public LoadConcentratedSpecial(double P,
                                LoadConcentratedSpecialCase Case = LoadConcentratedSpecialCase.Center)
     : base(new List <double>(){ P })
 {
     this._P   = P;
     this.Case = Case;
 }
 public LoadConcentratedSpecial(double P, 
     LoadConcentratedSpecialCase Case = LoadConcentratedSpecialCase.Center)
     :base(new List<double>(){P})
 {
     this._P = P;
     this.Case = Case;
 }