Thank you very much for your help! Now I will let LaTeX type GRASSL. It is a pity that two years ago I forced an editor of an English journal to typeset GRAßL in the References of one of my articles! -- Conrado Badenas (Assistant Lecturer) Department of Thermodynamics. University of Valencia c/. Doctor Moliner, 50 | e-m: Conrado.Badenas@uv.es 46100 Burjassot (Valencia) | Phn: +34-63864350 SPAIN | Fax: +34-63983385