"O rg a n ic Superconductors" by T ishiguro and K Y am aji is a recent publication in the w e ll-k n o w n "S pringer Series in S o lid State S cien ces". Chapter 6 is on DMET and MDT-TTF superconductors. DMET is a hybrid between TMTSF and ET molecular groups and hence interesting. Superconduc tivity in MDT-TTF is more interesting as it is a cross between tw o apparently non-superconducting groups TTF and BMDT-TTF. Chapter 1 is on DHIT salts. These superconductors are ir-anion molecules white the earlier ones have been rr-cation molecules. The authors are involved, along w ith th e ir colleagues a t th e KyotoThe mechanism of superconductivity in organic materials, which is yet to be decided from among a few possible mechanisms, is expertly documented in Chapters. Outline of BCS theory, s-, p-, d-pairings and singlet and triplet superconductivity are given w ith notes on Little's models of 1964 and 1983. Next the possibility of superconductivity from spin fluctuations in (TMTSF)*X, for example, is reviewed. That this mechanism is hotly debated for explaining high T, superconductivity has also been noted by the authors. They next explain 9

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It was theoretically predicted more that 20 years ago [A.G. Lebed and K. Yamaji, Phys. Rev. Lett. 80, 2697 (1998)] that a triplet quasi-two-dimensional (Q2D) superconductor could restore its superconducting state in parallel magnetic fields, which are higher than its upper critical magnetic field, H > Hc2(0). It is very likely that recently such phenomenon has been experimentally discovered in the Q2D superconductor UTe2 by Nicholas Butch, Sheng Ran and their colleagues and has been confirmed by Japanese-French team. We review our previous theoretical results, using such a general method that it describes the reentrant superconductivity in the above mentioned compound as well as will hopefully describe the similar phenomena, which can be discovered in other Q2D superconductors.