Rocha, Manuel. <br/><br/>
new technique for applying the method of the flat-jack in t-he determination of stresses inside rock masses / Manuel Ro-cha, Joao J. Baptista Lopes, Jorge Neves da Silva. 

 - Lisboa, Portugal : Laboratorio Nacional de Engenharia Civil 
 - 11 p. 
 - Memoria; No.324 / Laboratorio Nacional de Engenharia Civil .