Supertraining is VERY difficult to read.
I have read many, many books on weight training and bodybuilding, including (I believe) all of IRonminds, every MILO up to 2006 and many from elite FTS. I gave up on 'Supertraining' after the first page and have not read 'Science and practice', ansd have no intention to, either.
If you want to get stronger buy the 'West side barbell book of methods', in my opinion that, and 'the strongest shall survive' (written in the 70's so VERY ahead of its time) are two of the best books on training around.
If I could only keep one book it would be the west side book and I constantly refer back to it, Louie has gleaned all of the most useful information from those Russian books and incorporated it into the West side system anyway, so save yourself the trouble.
If you cannot afford them start reading the articles on this site, the articles on elite FTS and west side barbells site.