Dear Friend W.Papaserigi

thank you very much.i do same often but sometime email ID doesn't work and some time we need very old papers therefore we have to face little difficulty.

once again i am thankful full to you.

please try other paper also i need that too.

Hello, tring email to contact other researchers is very useful. You also can Google author's name and find his telephone number and his relevant work. Best wishes to you.

Since the paper(s) were published long before the advent of internet, some libraries (particularly old generation universities) keep such articles in CD ROMs like TEEEL. Make conscious efforts to visit such library in your country