Instabilities and… Mathematics and Its Applications, nr. 33 Editat de E. Tirapegui et al. 31 mar 1987 Hardback Preț: 398.92 lei 6-8 săpt.
Instabilities and… Mathematics and Its Applications, nr. 50 Editat de E. Tirapegui et al. 31 aug 1989 Hardback Preț: 397.59 lei 6-8 săpt.