David W. K. Yeung/ Leon A. Petrosyan
(3)
David W. K. Yeung/ Leon A. Petrosyan/ L. A. Petrosian
(1)
Leon A. Petrosyan (EDT)/ David Wing Kay Yeung (EDT)
(1)
Leon A. Petrosyan (EDT)/ Vladimir V. Mazalov (EDT)
(1)
Leon A. Petrosyan/ Nikolay Zenkevich
(1)