solve tie across voices

[Ursus]

<http://lilypond.1069038.n5.nabble.com/file/t4044/Image_001.png> 
I have tried to solve the final tie on the f but failed. I tried
r2 r4 << { b~ | b8 b c d e f4.~ | } \\ { f4~ | f2 r | } >> f4. e8 r2 |
But the tie got lost, probably because the <<\\>> construct creates a new
and separate voice. I looked into creating a tie across voices but still
haven't found a working solution. Now I'm sure this must be pretty simple.
Would the solution work similarly with slurs?



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