Numbering Peculiarities
No. 1 called v.1, no.1, published in 1974; no. 2 called v. 1, no. 4, published in 1974; no. 3 called v. 3, no.1, published in 1975; no. 4 called v. 1, no.2, published in 1976; no. 5 called v. 3, no.2, published in 1977; ; no.6 called v. 6, no. 3, published in 1978; no. 7 published in 1980.