Canadian Mathematical Society, 1981

Mathematical Sciences Publishers, 1979

Mathematical Sciences Publishers, 1978

Canadian Mathematical Society, 1978

Mathematical Sciences Publishers, 1976

Mathematical Sciences Publishers, 1974

Institute of Mathematics, Polish Academy of Sciences, 1975

Institute of Mathematics, Polish Academy of Sciences, 1974

Canadian Mathematical Society, 1972

Canadian Mathematical Society, 1971

Mathematical Sciences Publishers, 1972

Springer Science and Business Media LLC, 1971

Institute of Mathematics, Polish Academy of Sciences, 1972

Institute of Mathematics, Polish Academy of Sciences, 1973

Mathematical Sciences Publishers, 1971

Mathematical Sciences Publishers, 1970

Institute of Mathematics, Polish Academy of Sciences, 1970

Springer Science and Business Media LLC, 1969

Canadian Mathematical Society, 1970

Canadian Mathematical Society, 1969