Sommaire du Fascicule no. 1
        p. 26-29
        
        
        
        
      
    
  
        p. 50-58
        
        
        
        
      
    
  Sommaire du Fascicule no. 3
        p. 51-58
        
        
        
        
      
    
  Sommaire du Fascicule no. 4
        p. 27-34
        
        
        
        
      
    
  
      
      
        
      
      
  
    
    
    A periodic boundary value problem for a fourth order differential operator with a summable potential
    
    
  
  
  
        
          
        
      
 
      
        p. 35-49
        
        
        
        
      
    
  