[ON THE PROBLEM OF VOCAL CAPACITY OF TEACHERS DURING CLASS INSTRUCTION].
D035843:Biomedical Research; D006801:Humans; D012574:Schools; D013663:Teaching; D014831:Voice
CLINICAL RESEARCH; SCHOOLS; TEACHING; VOICE
ZUR PROBLEMATIK DER STIMMLEISTUNG BEI LEHRERN WAEHREND DES UNTERRICHTS.