Geodesic
On construction of bimodule resolutions with the help of Happel's lemma
Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 19, Tome 375 (2010), pp. 61-70

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A criterion for the sequence obtained with the help of Happel's lemma to be a minimal bimodule projective resolution is proved. This criterion is used to construct bimodule resolution for a family of self-injective algebras of tree class $D_4$. Bibl. – 6 titles. 
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     author = {Y. V. Volkov and A. I. Generalov and S. O. Ivanov},
     title = {On construction of bimodule resolutions with the help of {Happel's} lemma},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {61--70},
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     volume = {375},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2010_375_a4/}
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Y. V. Volkov; A. I. Generalov; S. O. Ivanov. On construction of bimodule resolutions with the help of Happel's lemma. Zapiski Nauchnykh Seminarov POMI, Problems in the theory of representations of algebras and groups. Part 19, Tome 375 (2010), pp. 61-70. http://geodesic.mathdoc.fr/item/ZNSL_2010_375_a4/