Nielsen-Olesen on Veneziano model and Nambu dual string model

Question

In the work of H B Nielsen and P Olesen in 1973 "Vortex-line models for dual strings," Nuclear Physics B 61-45–61, they mentioned that 

>"The many good experimental and theoretical features of the Veneziano model seem to suggest that an underlying string structure [1-4] of hadronic matter is a likely possibility."

as well as 

> "It is the purpose of the present article to point out that it is easy to build up classical field theories allowing for vortex lines (or similar string-like structures) with the property of having equations of motion identical with those of the Nambu dual string [2]."

Since the Refs [1-2] are mostly in the format of the Conference reports, as follows,

[1] Y. Nambu, Prec. Int. Conf. on symmetries and quark models, (Wayne State University, 1969);
H.B. Nielsen, 15th Int. Conf. on high energy physics, Kiev, 1970;
L. Sussldnd, Nuovo Cimento 69A (1970) 457.

[2] Y. Nambu, Lectures at the Copenhagen Summer Symposium, 1970.

I was wondering whether there are following up papers or published lecture notes on these Refs [1-2] in the literature?

Thanks in advance.

Comments

Do you mean following up papers by the same authors? Or else there are to many to list--- practically infinitely many, under the name "hadronic string model".