TY - BOOK ID - 126506383 TI - Recent soviet contributions to mathematics AU - Lefschetz, Solomon AU - LaSalle, Joseph Pierre PY - 1968 PB - New York (N.Y.): MacMillan, DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:126506383 AB - ER -