Nucleic Acids Res. 1999 Mar 15;27(6):1558-60.

Matz M, Shagin D, Bogdanova E, Britanova O, Lukyanov S, Diatchenko L, Chenchik A.

Amplification of cDNA ends based on template-switching effect and step-out PCR.

To counter template-switching happening from inside the oligonucleotide instead of its tail.