I met Manuel in 1986 in Oxford when attending my first international conference and had the chance to discuss with him about my work in such a way that I could improve it.. Since then we had several joint works and every time, I was impressed by his deep understanding of fundamental problems in our field. In addition to be an outstanding researcher, he was very kind and always took care of me during my sojourns in Zaragoza. My condolences go to his family and to those nearest to him.
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