References
- Helwig J.T., Council K.A. SAS Users Guide. SAS Institute, Raleigh 1979
- Whitman B.Y., Croughan J.L., Miller J.P., McKay J. Nonpsychiatiic predictors of narcotic dependence: A prospective study with a 5-year follow-up. Int. J. Addict. 1982; 17(3)473–491