Masthead.Published in:Fortschritte der Physik / Progress of Physics, 1970, v. 18, n. 4, p. fmi, doi. 10.1002/prop.19700180401Publication type:Article
Foldy-Wouthuysen Transformations and Related Problems.Published in:Fortschritte der Physik / Progress of Physics, 1970, v. 18, n. 4, p. 149, doi. 10.1002/prop.19700180402By:de Vries, E.Publication type:Article