Vassil Sgurev (EDT)/ Mincho Hadjiski (EDT)
(1)
Vassil Sgurev (EDT)/ Ronald R. Yager (EDT)/ Janusz Kacprzyk (EDT)/ Krassimir T. Atanassov (EDT)
(1)
Vassil Sgurev (EDT)/ Ronald R. Yager (EDT)/ Janusz Kacprzyk (EDT)/ Vladimir Jotsov (EDT)
(1)
Vassil Sgurev (EDT)/ Vincenzo Piuri (EDT)/ Vladimir Jotsov (EDT)
(1)
Vassil Sgurev (EDT)/ Vladimir Jotsov (EDT)/ Janusz Kacprzyk (EDT)
(1)