The paper proposes to establish the intersection curve and the unfoldings of three cylinders. The intersection of the curves was determined by the classical method, using the AutoCAD program, and the unfolded surfaces were realized by analytical methods. For this the Mathematica program was used.
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 Vlasov, A. K.: Curs de matematică superioară, Editura Tehnică, Timişoara, 1971;
 Popa, Carmen, Petre, Ivona: Mathematical methods to determinate the intersection curves of the cylinders, International Conference on Manufacturing Systems ICMaS, Bucureşti, 2004, tome 49, p. 595, ISBN 973-27-1102-7, ISSN 0035-4074
 Popa, Carmen: Mathematical method to unfold an oblique pyramid, Modelling and optimization in the machines building field, Bacau, 2004, vol I, 40.