Belgique (1) Imprisonment (1) Walls (1) Time (1) Prisoners (1) Necessity (Philosophy) (1) Nature (1) Juvenile delinquents (1) Interpersonal relations (1) Face (1) Extremities (Anatomy) (1) Equilibrium (1) Educators (1) Duress (Law) (1) Diplomatics (1) Detention of persons (1) Cognition (1) Technique (1) Research (1) Attitudes (1) Spectra (1) Relations (1) Students (1) First performances (1) Employees (1) Necesidad (Filosofía) (1) Coacción (Derecho) (1) Extremidades (1) Espectroscopia (1) Presos (1)