1.
Zdrav Prac
; 27(2): 106-12, 1977 Feb.
Article
in Czech
| MEDLINE
| ID: mdl-586992
Subject(s)
Blood Donors , Motivation , Socioeconomic Factors , Czechoslovakia , Humans , USSR , United States
2.
Zdrav Prac
; 25(7): 401-4, 1975 Jul.
Article
in Czech
| MEDLINE
| ID: mdl-1045819