This system is still under trial.
If you notice any problem with it, please, let us know: send an email to
p_erdos@renyi.hu
If you have a better version of our pdf files, also, please, send it to
us. Our policy is to post first always the original version and then (if your
one is better than our one not only because it is a better scanned in version
but because it is a retyped one or produced from the original text in some
other way, we would post it as a second version if it is noticably better than
ours.
If you have a relevant remark on these papers, please, inform us
about it and we shall consider if to post it.
Editors