Parts not readable in paper from 1979

[ndcroos]

Some parts in the paper from 1979 are fuzzy. Peter Dybjer has a clearer version available at
http://www.cse.chalmers.se/~peterd/papers/oplss15.html .
(These materials were made available in context of the Oregon programming languages summer school in 2015.)

[k4rtik]

There is another version available at which seems the most legible https://www.cs.tufts.edu/~nr/cs257/archive/per-martin-lof/constructive-math.pdf