Hello to every one. I'm presently embarking on a problem about electron emission under applied electric field. Of course, basically there are two mechanisms for electrons to escape into the vacuum from a sample: the thermionic and the tunneling. Here I'm concerned only with the latter. As usual, one assumes zero field in the sample duo to shielding effect. Often, the Nordheim-Fowler formalism is used to calculate the emission current. However, in some materials, such as one-dimensional, many-body effects are pronouncing, which cannot be accounted within the NF jargon. So, I'm wonderring if there's already in the literature a sufficiently general context to address this issue. I know there exists some, of which examples are given in the work by Bardeen and others. However, these methods involve approximations that are hardly justified. So, could anyone expose me to some extensive reviews on this problem? Thank you very much!!