Production of Two Non-Conjugate Leptoquarks in $e^-e^-$ Collisions
  We study the production of scalar and vector leptoquarks in $e^-e^-$ scattering. We use the most general couplings to the known fermions which are dimensionless, baryon and lepton number conserving, and $SU(3)_c \otimes SU(2)_L \otimes U(1)_Y$ invariant. Expressions are presented for production cross sections and predictions are given for future linear colliders. 
Frank Cuypers (PSI), Paul H. Frampton (UNC-CH), Reinhold Rueckl (Uni.   Wuerzburg)