Ondrus, J. <br/><br/>
Akordeonove etudy I :  For Akkordeon /  nots; 
Jan Ondeua, Maecela Dikanova, / 
 - Praha :  Editio Supraphon,  1967. 
 - 23 p. :  not ;  31 s. 
<br/><br/>Akkordeon- etuden II (1968, 19 p.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Instrumental music--Etude