1[1]Hochschild G.On the cohomology groups of an associative algebra.Ann Math,1945,46:58～67
2[2]Gerstenhaber M.On the deformation of rings and algebras.Ann Math,1964,79:59～103
3[3]Assem I,de la Pena J A.The foundamental groups of a triangular algebra.Comm Algebra,1996,24(1):187～208
4[4]Happel D.Hochschild Cohomology of Finite Dimensional Algebras.Séminare M -P Malliavin,Paris,1987-88.Lecture Notes in Mathematics,Vol 1404.Berlin:Springer,1989.108～126
5[5]Skowronski A.Simply connected algebras and Hochschild cohomologies.Canad Math Proc,1993,14:431～447
6[6]Zhang Pu.Selforthogonal radical algebras.Canad Math Soc Conf Proc,1998,24:563～569
7[7]Happel D.Hochschild cohomology of Auslander algebras.Topics in algebra.Part 1(Warsaw 1988).Banach Center Publ 26,Part 1.PWN,Warsaw,1990.303～310
8[8]Assem I,Marcos E N,de la Pena J A.The simple connectness of a tame tilted algebra.J Alg,2001,237:647～656
9[9]Geiss Ch,de la Pena J A.On the deformation theory of algebras.Manuscripta Math,1995,88:191～208
10[10]Cibils C.Cohomology of incidence algebras and simplicial complexes.J Pure Appl Algebra,1989,56:221～232
