Dalton K, 1981
Connell-Tatum EB, 1981
Dmowski WP et al., 1981
Hilgers TW et al., 1981
Serra A, 1981
Bolton GC, 1981
Dalton ME, 1981
Adashi EY et al., 1981
Burgoyne RD et al., 1981
Cowan LD et al., 1981
Hawkins DF, 1974
World Health Organization, 1981
Fleischer AC et al., 1981
Brockington IF et al., 1981
Haney AF et al., 1981
Cortesi S et al., 1981
Blum I et al., 1981
Naples JD et al., 1981
Villanueva B et al., 1981
Hodgen GD et al., 1981
Robbins J, 1981
Ropert JF et al., 1981
Blankstein J et al., 1981
Gautray JP et al., 1981