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EXPLICIT AND IMPLICIT Contributors to mixed hypergraph coloring. (this direction could not be created by one person). WITH VICTOR CHEPOI , FEODOR DRAGAN AND ANDREAS BRANDSTÄDT (DUISBURG, Germany, 1994). With curt Lindner, chris Rodger and shen hao (Catania, Italy, 1994).
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EXPLICIT AND IMPLICIT Contributors to mixed hypergraph coloring (this direction could not be created by one person)
WITH VICTOR CHEPOI, FEODOR DRAGAN AND ANDREAS BRANDSTÄDT (DUISBURG, Germany, 1994)
With curt Lindner, chris Rodger and shenhao (Catania, Italy, 1994)
With M. Borowiecki, a. niculitsa and h.-j. voss (Dresden, Germany, 1999)
With Vadim vizing and alexander zykov(Odessa, Ukraine, 9/11/2001)
WITH SASHA KOSTOCHKA, NOGAALON AND DOUG WEST (URBANA, usa, 2002)
WITH DOUG WEST, HIS WIFE CHING AND MY WIFE GEORGETA (URBANA, usa, 2002)
WITH ROBIN WILSON, SALVATORE MILICI, MARIO GIONFRIDDO AND GAETANO QUATTROCCHI (CATANIA, Italy, 2003)
WITH FRANK HARARY AND LUCIA GIONFRIDDO (BOCA RATON, usa, 2004)
WITH LORENZO MILAZZO AND LUCIA GIONFRIDDO (CATANIA, Italy, 2007)
With Lorenzo Milazzo, curt Lindner and alexrosa (Catania, Italy, 2009)
Charlie Colbourn andGaetano quattrocchi(Catania, Italy, 2009)
WITH GIOVANNI LO FARO AND MARIO GIONFRIDDO (PERUGIA, Italy, 2012)
WITH JULIAN ALLAGAN AND diane porter (montgomery, usa, 2013)
WITH KEFENGDIAO, PING ZHAO AND THEIR GROUP (LINYI, china, 2015)
Confucius: 551 - 479 BC, the most famous Chinese philosophermy 2015 trip to china was funded by Confucius institute of troy university this picture was taken at Confucius temple, Qufu, China