Image: https://cdn.whensthebirthday.com/gallery/2017/1/christian-doppler/yovisto-blog-cristiano-y-el.jpg
Christian Doppler
professions.scientist de Austria
Image: https://cdn.whensthebirthday.com/gallery/2017/1/christian-doppler/yovisto-blog-cristiano-y-el.jpg
professions.scientist de Austria