[1]
Extensions of Respondent-Driven Sampling: A New Approach to the Study of Injection Drug Users Aged 18–25[J] . Douglas D. Heckathorn,Salaam Semaan,Robert S. Broadhead,James J. Hughes.AIDS and Behavior . 2002 (1)
[1]
Extensions of Respondent-Driven Sampling: A New Approach to the Study of Injection Drug Users Aged 18–25[J] . Douglas D. Heckathorn,Salaam Semaan,Robert S. Broadhead,James J. Hughes.AIDS and Behavior . 2002 (1)