Published in 'Handbook of flow visualization' (p.189-217) under supervision of Prof. Wen Jei Yang (Univ. of Michigan, Ann Arbor, USA); ed. by Hemisphere publ. compSIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1990 n.193 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc