Professor Oscar Saavedra San Martin passed away on 8 April 2018 at Bonvicino-Italy. The Organizing Committee of the 20th International Symposium on Very High Energy Cosmic Rays-ISVHECRI-2018, held in Nagoya, Japan decided to pay a tribute to Oscar, born on 29 June, 1940 at LaPaz, Bolivia. During the banquet, a small presentation in honour to Oscar was scheduled in a special section of Wednesday 23 May 2018. His last participation was at the 19th ISVHECRI held in Moscow, Russian Federation, during the period 22-27 August 2016. Oscar joined the BASJE-Bolivian Air Shower Joint Experiment in 1966, a collaboration between Bolivia and Japan. The aim of BASJE was to search for high energy γ's coming mainly from the center of Galaxy, due to the Chacaltaya location. From 1967 to 1968 he served as Director of the Cosmic Ray Laboratory at Chacaltaya following the BASJE experiments. Due to his huge contribution to Bolivian Science, Oscar received in 2009 the Doctor Honoris Causa title and was nominated Scientific Ambassador of his motherland. He gained his Doctorate from Milan University in 1964 and after immigration to Italy was a staff member of Torino University. On his retirement Torino University awarded him the title of Emeritus Professor.
Observation of Very-High-Energy Cosmic Rays with the Tibet Air Shower Experiment—Quest for the Galactic Cosmic Ray Origin—