References for the model of Ignatiev and Kuzmin
 
The model was initially published in 1986 as an INR preprint P-0500 (in Russian).
 
Its abridged version appeared in Yadernaya Fizika v.46, p. 786 (1987) (the English translation is available in Sov. J. Nucl. Phys. but not on-line yet).
 
A more complete English version is: ICTP preprint IC/87/13 (1987).
 
An overview and update can be found here.