In the 1920s, G.J. Ramstedt and E.D. Polivanov advocated the inclusion of Korean. Decades later, in his 1952 book, Ramstedt rejected the Ural–Altaic hypothesis but again included Korean in Altaic, an inclusion followed by most leading Altaicists (supporters of the theory) to date.Gustaf John Ramstedt (1952): Einführung in die altaische Sprachwissenschaft ("Introduction to Altaic Linguistics"). Volume I, Lautlehre ("Phonology"). His book contained the first comprehensive attempt to identify regular correspondences among the sound systems within the Altaic language families.
in the 1920s gj ramstedt and ed polivanov advocated the inclusion of korean decades later in his 1952 book ramstedt rejected the ural–altaic hypothesis but again included korean in altaic an inclusion followed by most leading altaicists (supporters of the theory) to dategustaf john ramstedt (1952) einführung in die altaische sprachwissenschaft ("introduction to altaic linguistics") volume i lautlehre ("phonology") his book contained the first comprehensive attempt to identify regular correspondences among the sound systems within the altaic language families