IRINA MARSHAKOVA-SHAIKEVICHishaikev@mail.ru
Marshakova-Sahikevich I, "System of document connections based on references" Nauch-Techn.Inform, Ser.2 (6):3-8, 1973 (Paper in Russian)Extended summary of above paper in English - http://garfield.library.upenn.edu/marshakova/marshakovanauchtechn1973.pdf